seamless alloy steel pipe ASTM A335 P9
Overview
Standard: ASTM A335
Grade Group: P5,P9,P11,P22,P91, P92 etc.
Thickness: 1 - 100 mm
Outer Diameter(Round): 10 - 1000 mm
Length: Fixed length or random length
Section Shape: Round
Place of Origin: China
Certification: ISO9001:2008
Alloy Or Not: Alloy
Application: Boiler Pipe
Surface Treatment: As customer's requirement
Technique: Hot Rolled/ Cold Drawn
Heat treatment: Annealing/normalizing/Tempering
Special Pipe: Thick Wall Pipe
Usage: high pressure steam pipe, Boiler and Heat Exchanger
Test: ET/UT
Application
It is mainly used to make high-quality alloy steel boiler pipe , heat exchanged pipe, high pressure steam pipe for petroleum and chemical industry
Main Grade
Grade of high-quality alloy pipe :P1,P2,P5,P9,P11,P22,P91,P92 etc
Chemical Component
| Grade | UN | C≤ | Mn | P≤ | S≤ | Si≤ | Cr | Mo |
| Sequiv. | ||||||||
| P1 | K11522 | 0.10~0.20 | 0.30~0.80 | 0.025 | 0.025 | 0.10~0.50 | – | 0.44~0.65 |
| P2 | K11547 | 0.10~0.20 | 0.30~0.61 | 0.025 | 0.025 | 0.10~0.30 | 0.50~0.81 | 0.44~0.65 |
| P5 | K41545 | 0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.5 | 4.00~6.00 | 0.44~0.65 |
| P5b | K51545 | 0.15 | 0.30~0.60 | 0.025 | 0.025 | 1.00~2.00 | 4.00~6.00 | 0.44~0.65 |
| P5c | K41245 | 0.12 | 0.30~0.60 | 0.025 | 0.025 | 0.5 | 4.00~6.00 | 0.44~0.65 |
| P9 | S50400 | 0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50~1.00 | 8.00~10.00 | 0.44~0.65 |
| P11 | K11597 | 0.05~0.15 | 0.30~0.61 | 0.025 | 0.025 | 0.50~1.00 | 1.00~1.50 | 0.44~0.65 |
| P12 | K11562 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.5 | 0.80~1.25 | 0.44~0.65 |
| P15 | K11578 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 1.15~1.65 | – | 0.44~0.65 |
| P21 | K31545 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.5 | 2.65~3.35 | 0.80~1.60 |
| P22 | K21590 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.5 | 1.90~2.60 | 0.87~1.13 |
| P91 | K91560 | 0.08~0.12 | 0.30~0.60 | 0.02 | 0.01 | 0.20~0.50 | 8.00~9.50 | 0.85~1.05 |
| P92 | K92460 | 0.07~0.13 | 0.30~0.60 | 0.02 | 0.01 | 0.5 | 8.50~9.50 | 0.30~0.60 |
A New designation established in accordance with Practice E 527 and SAE J1086, Practice for Numbering Metals and Alloys (UNS). B Grade P 5c shall have a titanium content of not less than 4 times the carbon content and not more than 0.70 %; or a columbium content of 8 to 10 times the carbon content.
Mechanical Property
| Mechanical properties | P1,P2 | P12 | P23 | P91 | P92,P11 | P122 |
| Tensile strength | 380 | 415 | 510 | 585 | 620 | 620 |
| Yield strength | 205 | 220 | 400 | 415 | 440 | 400 |
Heat Treatment
| Grade | Heat Treatment Type | Normalizing Temperature Range F [C] | Subcritical Annealing or Tempering |
| P5, P9, P11, and P22 | Temperature Range F [C] | ||
| A335 P5 (b,c) | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| Subcritical Anneal (P5c only) | ***** | 1325 – 1375 [715 - 745] | |
| A335 P9 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| A335 P11 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1200 [650] | |
| A335 P22 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| A335 P91 | Normalize and Temper | 1900-1975 [1040 - 1080] | 1350-1470 [730 - 800] |
| Quench and Temper | 1900-1975 [1040 - 1080] | 1350-1470 [730 - 800] |
Tolerance
For pipe ordered to inside diameter, the inside diameter shall not vary more than 6 1 % from the specified inside diameter
Permissible Variations in Outside Diameter
| NPS Designator | in | mm | in | mm |
| 1⁄8to 11⁄2, incl | 1⁄64 (0.015) | 0.4 | 1⁄64(0.015) | 0.4 |
| Over 11⁄2 to 4, incl. | 1⁄32(0.031) | 0.79 | 1⁄32(0.031) | 0.79 |
| Over 4 to 8, incl | 1⁄16(0.062) | 1.59 | 1⁄32(0.031) | 0.79 |
| Over 8 to 12, incl. | 3⁄32(0.093) | 2.38 | 1⁄32(0.031) | 0.79 |
| Over 12 | 6 1 % of the specified outside diameter |
Test Requirement
Hydraustatic Test:
The Steel Pipe Should Be Tested Hydraulically One By One. The Maximum Test Pressure Is 20 MPa. Under The Test Pressure, The Stabilization Time Should Be Not Less Than 10 S, And The Steel Pipe Should Not Leak.
After The User Agrees, The Hydraulic Test Can Be Replaced By Eddy Current Testing Or Magnetic Flux Leakage Testing.
Nondestructive Test：
Pipes That Require More Inspection Should Be Ultrasonically Inspected One By One. After The Negotiation Requires The Consent Of The Party And Is Specified In The Contract, Other Non-Destructive Testing Can Be Added.
Flattening Test：
Tubes With An Outer Diameter Greater Than 22 Mm Shall Be Subjected To A Flattening Test. No Visible Delamination, White Spots, Or Impurities Should Occur During The Entire Experiment.
Hardness Test:
For pipe of Grades P91, P92, P122, and P911, Brinell, Vickers, or Rockwell hardness tests shall be made on a specimen from each lot
Bend Test:
For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test. Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser
Product Detail
ASTM A335 P5 is an alloy steel seamless ferritic high temperature pipe of American standard. Alloy tube is a kind of seamless steel tube, its performance is much higher than the general seamless steel tube, because this kind of steel tube contains more C, the performance is less than the ordinary seamless steel tube, so the alloy tube is widely used in petroleum, aerospace, chemical, electric power, boiler, military and other industries.
Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous
Corresponding domestic alloy steel :1Cr5Mo GB 9948-2006 “Seamless Steel Pipe Standard for Petroleum Cracking”
- Payment:30% Deposit, 70% L/C Or B/L Copy Or 100% L/C At Sight
- Min.Order Quantity:1 PC
- Supply Ability:Annual 20000 Tons Inventory Of Steel Pipe
- Lead Time:7-14 Days If In Stock, 30-45 Days To Produce
- Packing:Black Vanishing, Bevel And Cap For Every Single Pipe; OD Below 219mm Need To Pack In Bundle, And Each Bundle No Exceed 2 Tons.
Overview
| Standard: ASTM A335 | Alloy Or Not: Alloy |
| Grade Group: P5 | Application: Boiler Pipe |
| Thickness: 1 – 100 Mm | Surface Treatment: As Customer’s Requirement |
| Outer Diameter(Round): 10 – 1000 Mm | Technique: Hot Rolled/ Cold Drawn |
| Length: Fixed Length Or Random Length | Heat Treatment: Annealing/Normalizing/Tempering |
| Section Shape: Round | Special Pipe: Thick Wall Pipe |
| Place Of Origin: China | Usage: High Pressure Steam Pipe, Boiler And Heat Exchanger |
| Certification: ISO9001:2008 | Test: ET/UT |
Application
It Is Mainly Used To Make High-Quality Alloy Steel Boiler Pipe , Heat Exchanged Pipe, High Pressure Steam Pipe For Petroleum And Chemical Industry
Chemical Component
|
Compositions |
Data |
| UNS Designa-tion | K41545 |
| Carbon(max.) | 0.15 |
| Manganese | 0.30-0.60 |
| Phosphorus(max.) | 0.025 |
| Silicon(max.) | 0.50 |
| Chromium | 4.00-6.00 |
| Molybdenum | 0.45-0.65 |
| Other Elements | … |
Mechanical Property
| Properties | Data |
| Tensile Strength, Min, (MPa) | 415 Mpa |
| Yield Strength, Min, (MPa) | 205 Mpa |
| Elongation, Min, (%), L/T | 30/20 |
Heat Treatment
| Grade | Heat Treatment Type | Normalizing Temperature Range F [C] | Subcritical Annealing Or Tempering |
| P5, P9, P11, And P22 | Temperature Range F [C] | ||
| A335 P5 (B,C) | Full Or Isothermal Anneal | ||
| A335 P5b | Normalize And Temper | ***** | 1250 [675] |
| A335 P5c | Subcritical Anneal | ***** | 1325 – 1375 [715 - 745] |
Tolerance
For Pipe Ordered To Inside Diameter, The Inside Diameter Shall Not Vary More Than ±1 % From The Specified Inside Diameter
Permissible Variations In Outside Diameter
| NPS Designator | Positive tolerance | negative tolerance | ||
| In | Mm | In | Mm | |
| 1⁄8to 11⁄2, Incl | 1⁄64 (0.015) | 0.4 | 1⁄64(0.015) | 0.4 |
| Over 11⁄2 To 4, Incl. | 1⁄32(0.031) | 0.79 | 1⁄32(0.031) | 0.79 |
| Over 4 To 8, Incl | 1⁄16(0.062) | 1.59 | 1⁄32(0.031) | 0.79 |
| Over 8 To 12, Incl. | 3⁄32(0.093) | 2.38 | 1⁄32(0.031) | 0.79 |
| Over 12 | ±1 % Of The Specified Outside Diameter |
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Test Requirement
Hydraustatic Test:
The Steel Pipe Should Be Tested Hydraulically One By One. The Maximum Test Pressure Is 20 MPa. Under The Test Pressure, The Stabilization Time Should Be Not Less Than 10 S, And The Steel Pipe Should Not Leak.
After The User Agrees, The Hydraulic Test Can Be Replaced By Eddy Current Testing Or Magnetic Flux Leakage Testing.
Nondestructive Test：
Pipes That Require More Inspection Should Be Ultrasonically Inspected One By One. After The Negotiation Requires The Consent Of The Party And Is Specified In The Contract, Other Non-Destructive Testing Can Be Added.
Flattening Test：
Tubes With An Outer Diameter Greater Than 22 Mm Shall Be Subjected To A Flattening Test. No Visible Delamination, White Spots, Or Impurities Should Occur During The Entire Experiment.
Hardness Test:
For Pipe Of Grades P91, P92, P122, And P911, Brinell, Vickers, Or Rockwell Hardness Tests Shall Be Made On A Specimen From Each Lot
Bend Test:
For Pipe Whose Diameter Exceeds NPS 25 And Whose Diameter To Wall Thickness Ratio Is 7.0 Or Less Shall Be Subjected To The Bend Test Instead Of The Flattening Test. Other Pipe Whose Diameter Equals Or Exceeds NPS 10 May Be Given The Bend Test In Place Of The Flattening Test Subject To The Approval Of The Purchaser
Material & Manufacture
Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.
Heat Treatment
- A / N+T
- N+T / Q+T
- N+T
Mechanical Tests Specified
- Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test
- For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot. For small lots, at least one pipe shall be tested.
- For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe.
Notes for Bend Test:
- For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test.
- Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser.
- The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion.
ASTM A335 P5 seamless steel tubes are suitable for water, steam, hydrogen, sour oil, etc. If used for water vapor, its maximum operating temperature is 650℃; When used in working medium such as sour oil, it has good high-temperature sulfur corrosion resistance, and is often used in high-temperature sulfur corrosion conditions of 288~550℃.
Production process:
1. Hot rolling (extruded seamless steel tube) : round tube billet → heating → perforation → three-roll cross rolling, continuous rolling or extrusion → tube stripping → sizing (or reducing) → cooling → straightening → water pressure test (or defect detection) → marking → storage
2. Cold drawing (rolling) seamless steel tube: round tube billet → heating → perforation → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → water pressure test (flaw detection) → marking → storage
Application Scenarios:
In atmospheric and vacuum devices for processing high-sulfur crude oil, ASTM A335 P5 seamless steel tubes are mainly used for the bottom pipelines of atmospheric and vacuum towers, furnace tubes of atmospheric and vacuum furnaces, high-speed sections of atmospheric and vacuum oil conversion lines and other high-temperature oil and gas pipelines containing sulfur.
In FCC units, ASTM A335 P5 seamless steel tubes are mainly used in high-temperature slurry, catalyst and return refining pipelines, as well as some other high-temperature sulfur oil and gas pipelines.
In delayed coking unit, ASTM A335 P5 seamless steel pipe is mainly used for high temperature feed pipe at the bottom of coke tower and high temperature oil and gas pipe at the top of coke tower, furnace pipe at the bottom of coke furnace, pipe at the bottom of fracking tower and some other high temperature oil and gas pipe containing sulfur.
Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.
ASTM A335 P9 is an alloy steel seamless ferritic high temperature pipe of American standard. Alloy tube is a kind of seamless steel tube, its performance is much higher than the general seamless steel tube, because this kind of steel tube contains more C, the performance is less than the ordinary seamless steel tube, so the alloy tube is widely used in petroleum, aerospace, chemical, electric power, boiler, military and other industries.
A335 P9 is a high temperature chromium-molybdenum alloy heat resistant steel produced according to the American standard. Because of its excellent oxidation resistance, high temperature strength and sulfide corrosion resistance, it is widely used in high temperature and high pressure inflammable and explosive pipelines of petroleum refining plants, especially direct heat pipe of heating furnace, medium temperature can reach 550~600℃.
Corresponding domestic alloy steel :1Cr5Mo GB 9948-2006 “Seamless Steel Pipe Standard for Petroleum Cracking”
Overview
| Standard: ASTM A335 | Alloy Or Not: Alloy |
| Grade Group: P9 | Application: Boiler Pipe |
| Thickness: 1 – 100 Mm | Surface Treatment: As Customer’s Requirement |
| Outer Diameter(Round): 10 – 1000 Mm | Technique: Hot Rolled/ Cold Drawn |
| Length: Fixed Length Or Random Length | Heat Treatment: Annealing/Normalizing/Tempering |
| Section Shape: Round | pecial Pipe: Thick Wall Pipe |
| Place Of Origin: China | Usage: High Pressure Steam Pipe, Boiler And Heat Exchanger |
| Certification: ISO9001:2008 | Test: ET/UT |
Chemical Component
Chemical composition of seamless steel pipes for petroleum cracking
|
ASTM A335M |
C |
SI |
Mn |
P |
S |
Cr |
Mo |
|
P9 |
≦0.15 |
0.25-1.00 |
0.30-0.60 |
≦0.025 |
≦0.025 |
8.00-10.00 |
0.90-1.10 |
Mechanical Property
|
Properties |
Data |
| Tensile strength, min, (MPa) | 415 Mpa |
| Yield strength, min, (MPa) | 205 Mpa |
| Elongation, min, (%), L/T | 14 |
| HB | 180 |
Heat Treatment
|
Grade |
Heat Treatment Type | Normalizing Temperature Range F [C] | Subcritical Annealing Or Tempering |
| P5, P9, P11, And P22 | |||
| A335 P9 | Full Or Isothermal Anneal | ||
| Normalize And Temper | ***** | 1250 [675] |
A335 P9 can be heat treated by annealing or normalizing + tempering processes. Annealing process cooling speed is slow, affect the production rhythm, production process is difficult to control, and high cost; Therefore, the actual production rarely use annealing heat treatment process, often use normalizing + tempering heat treatment instead of annealing process, to achieve industrial production.
A335 P9 steel because it does not contain V, Nb and other microalloying elements, hence the normalizing temperature than A335 P91 steel is lower, 950~1050℃, hold for 1h, the process when normalizing most of the carbide dissolved but no obvious grain growth, but too high normalizing temperature is prone to austenite grain coarse: tempering temperature is 740-790℃, in order to obtain lower hardness, tempering temperature time should be appropriately extended.
Tolerance
For Pipe Ordered To Inside Diameter, The Inside Diameter Shall Not Vary More Than ±1 % From The Specified Inside Diameter
Permissible Variations In Outside Diameter
|
NPS Designator |
Positive tolerance |
negative tolerance |
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|
In |
Mm |
In |
Mm |
|
|
1⁄8to 11⁄2, Incl |
1⁄64 (0.015) |
0.4 |
1⁄64(0.015) |
0.4 |
|
Over 11⁄2 To 4, Incl. |
1⁄32(0.031) |
0.79 |
1⁄32(0.031) |
0.79 |
|
Over 4 To 8, Incl |
1⁄16(0.062) |
1.59 |
1⁄32(0.031) |
0.79 |
|
Over 8 To 12, Incl. |
3⁄32(0.093) |
2.38 |
1⁄32(0.031) |
0.79 |
|
Over 12 |
±1 % Of The Specified |
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Production process:
A335 is designed according to the equipment status of Tianjin steel pipe and the characteristics of A335 P9 steel P9 trial-producing process of seamless steel pipe: Electric arc furnace steelmaking → ladle refining → vacuum degassing → die casting → tube blank forging → tube blank annealing → tube blank heating → oblique piercing → PQF continuous tube rolling mill tube rolling → three-roll sizing → cooling bed cooling → tube end According to cutting → steel pipe straightening → magnetic flux leakage detection → heat treatment → straightening → ultrasonic flaw detection → hydraulic test → size and appearance inspection →storage.
manufacturing process：
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Item number |
manufacturing process |
Action and Quality Control |
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1 |
Pre-inspection meeting |
Minutes of the meeting |
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2 |
ASEA-SKF |
Adjust chemical composition |
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*Chemical composition analysis |
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*melting temperature |
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3 |
CCM |
billet |
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4 |
Raw material inspection |
Blank inspection and quality confirmation |
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*Appearance status: The surface of the billet should be free of defects such as scarring, slag, pinholes, cracks, etc. Imprints, dents and pits must not exceed 2.5mm |
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5 |
Blank heating |
Heating billets in a rotary furnace |
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*Control heating temperature |
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6 |
pipe perforation |
Pierce with a guide/guide plate punch |
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*Control the temperature when piercing |
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* Control the size after perforation |
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7 |
Hot Rolled |
Hot rolling in continuous tube mills |
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*Set the pipe wall thickness |
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8 |
Size |
Control outside diameter and wall thickness dimensions |
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* Complete outer diameter machining |
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* Complete wall thickness machining |
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9 |
chemical composition |
Chemical composition analysis |
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* Acceptance criteria for chemical composition. The results of chemical composition analysis should be recorded in the material book. |
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10 |
Normalizing + Tempering |
Heat treatment (normalizing) is performed after hot rolling. Heat treatment should pay attention to control the temperature and duration. |
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After heat treatment, the mechanical properties of the product should meet the ASTM A335 standard |
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11 |
air cooling |
Step-by-step cooling bed |
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12 |
sawing |
Sawing to specified length |
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* Steel pipe length control |
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13 |
Straightness (if necessary) |
Controls flatness. |
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After straightening, the straightness should be in accordance with ASTM A335 |
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14 |
Inspection and Acceptance |
Appearance and Dimensional Inspection |
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*Steel dimensional tolerances should be in accordance with ASTM A999 |
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Note: Outer diameter tolerance: ±0.75%D |
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*Appearance inspection should be carried out one by one according to ASTM A999 standard to avoid poor surface |
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15 |
flaw detection |
*The whole body of the steel pipe should be ultrasonically inspected for longitudinal defects according to ISO9303/E213 |
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Ultrasonic testing: |
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16 |
Mechanical property test |
(1) Tensile (longitudinal) test and flattening test |
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Inspection frequency |
5%/batch, at least 2 tubes |
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Min |
Max |
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P9 |
Yield Strength（Mpa） |
205 |
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tensile strength (MPa) |
415 |
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Elongation |
According to ASTM A335 standard |
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Flattening experiment |
According to ASTM A999 standard |
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(2) Hardness test |
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Test frequency: same as tensile test |
1 piece/batch |
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HV&HRC |
≤250HV10&≤25 HRC HV10≤250&HRC≤25 |
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Note: Vickers hardness test standard: ISO6507 or ASTM E92; |
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Rockwell hardness test standard: ISO6508 or ASTM E18 |
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17 |
NDT |
Each steel pipe shall be tested in accordance with the requirements of testing methods E213, E309 or E570. |
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18 |
water pressure test |
Hydrostatic testing according to ASTM A999, test pressure |
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19 |
bevel |
Compliant beveling of both ends of the steel pipe according to ASTM B16.25fig.3(a) |
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20 |
Measurement of weight and length |
*Single weight tolerance: -6%~ +4%. |
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21 |
Pipe standard |
The outer surface of the steel pipe shall be spray marked according to ASTM A335 standard and customer requirements. The marking contents are as follows: |
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“Length Weight TPCO ASTM A335 Year-Month Dimensions P9 S LT**C ***MPa/NDE Heat Number Lot Number Tube Number |
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22 |
painted |
The outer surface of the tube is painted according to the factory standard |
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23 |
pipe end cap |
**There should be plastic caps at both ends of each tube |
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24 |
material list |
*Material book should be provided according to EN10204 3.1. ”Customer PO should be reflected in the material book. |
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