English
中文

Hot-selling 30 Inch Seamless Structural Steel Pipe Seamless Carbon Steel Seamless Pipe

Hot-selling 30 Inch Seamless Structural Steel Pipe Seamless Carbon Steel Seamless Pipe Featured Image
  • Hot-selling 30 Inch Seamless Structural Steel Pipe Seamless Carbon Steel Seamless Pipe
  • Hot-selling 30 Inch Seamless Structural Steel Pipe Seamless Carbon Steel Seamless Pipe
  • Hot-selling 30 Inch Seamless Structural Steel Pipe Seamless Carbon Steel Seamless Pipe

Short Description:

Seamless steel tubes for structural purposes, Seamless steel tubes for mechanical structures in GB/8162-2008 Standard. material include High-quality carbon steel and low alloy steel,such as 10,20,35,45 and Q345,Q460,Q490,42CrMo,35CrMo.


  • 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.
    • Download as PDF

    Product Detail

    Q345

    Product Tags

    It truly is our responsibility to fulfill your requirements and successfully provide you. Your fulfillment is our best reward. We’re seeking forward in your check out for joint development for Hot-selling 30 Inch Seamless Structural Steel Pipe Seamless Carbon Steel Seamless Pipe, We warmly welcome domestic and overseas customers send inquiry to us ,we have 24hours working team! Anytime anywhere we are still here to be your partner.
    It truly is our responsibility to fulfill your requirements and successfully provide you. Your fulfillment is our best reward. We’re seeking forward in your check out for joint development for China Seamless Steel Pipes and Carbon Steel Seamless Pipe, Adhering to the principle of “Enterprising and Truth-Seeking, Preciseness and Unity”, with technology as the core, our company continues to innovate, dedicated to providing you with the highest cost-effective products and solutions and meticulous after-sales service. We firmly believe that: we have been outstanding as we’re specialized.

    Overview

    Application

    It Is Mainly Used To Make Carbon Structural Steel, Alloy Structural Steel and mechanical structures.

    Main Grade

    Grade Of Carbon Structural Steel: 10,20,35, 45,Q345,Q460,Q490,Q620,, Etc

    Grade Of Alloy Structural Steel: 42CrMo,35CrMo, Etc

    Chemical Component

    Steel Grade Quality level Chemical composition
    C Si Mn P S Nb V Ti Cr Ni Cu Nd Mo B Als”
    no greater than not less than
     Q345 A 0.2 0.5 1.7 0.035 0.035       0.3 0.5 0.2 0.012 0.1 —— —
    B 0.035 0.035
    C 0.03 0.03 0.07 0.15 0.2   0.015
    D 0.18 0.03 0.025
    E 0.025 0.02
     Q390 A 0.2 0.5 1.7 0.035 0.035 0.07 0.2 0.2 0.3 0.5 0.2 0.015 0.1 — —
    B 0.035 0.035
    C 0.03 0.03   0,015
    D 0.03 0.025
    E 0.025 0.02
    Q42O A 0.2 0.5 1.7 0.035 0.035 0.07 0.2 0.2 0.3 0.8 0.2 0.015 0.2 —— ——
    B 0.035 0.035
    C 0.03 0.03 0.015
    D 0.03 0.025
    E 0.025 0.02
    Q46O C 0.2 0.6 1.8 0.03 0.03 0.11 0.2 0.2 0.3 0.8 0.2 0.015 0.2 0.005 0.015
    D 0.03 0.025
    E 0.025 0.02
    Q500 C 0J8 0.6 1.8 0.025 0.02 0.11 0.2 0.2 0.6 0.8 0.2 0.015 0.2 0.005 0.015
    D 0.025 0.015
    E 0.02 0.01
    Q550 C 0.18 0.6 2 0.025 0,020 0.11 0.2 0.2 0.8 0.8 0.2 0.015 0.3 0.005 0.015
    D 0.025 0,015
    E 0.02 0.01
    Q62O C 0.18 0.6 2 0.025 0.02 0.11 0.2 0.2 1 0.8 0.2 0.015 0.3 0.005 0.015
    D 0.025 0.015
    E 0.02 0.01
    A. In addition to Q345A and Q345B grades, the steel should contain at least one of the refined grain elements Al, Nb, V, and Ti. According to the needs, the supplier can add one or more refined grain elements. The maximum value shall be as specified in the table. When combined, Nb + V + Ti is not more than 0.22%b. For Q345, Q390, Q420 and Q46O grades, Mo + Cr is not greater than 0.30%c. When Cr and Ni of each grade are used as residual elements, the content of Cr and Ni should not be greater than 0.30%; when it is necessary to add, the content should meet the requirements in the table or be determined by the supplier and the buyer through consultation.d. If the supplier can ensure that the nitrogen content meets the requirements in the table, the nitrogen content analysis may not be performed. If Al, Nb, V, Ti and other alloy elements with nitrogen fixation are added to the steel, the nitrogen content is not limited. The nitrogen fixation content should be specified in the quality certificate.
    E. When using full aluminum, the total aluminum content Alt ≥ 0020%.

    Grade

    Carbon equivalent CEV (mass fraction) /%

    Nominal wall thickness s≤ 16mm

    Nominal wall thickness S2>16 mm〜30 mm

    Nominal wall thickness S>30mm

    Hot rolled or normalized normalized

    Quenching ＋tempering

    Hot rolled or normalized

    Quenching ＋tempering

    Hot rolled or normalized

    Quenching ＋tempering
    Q345

    <0.45

    —

    <0.47

    —

    <0.48

    一
    Q390

    <0.46

    一

    W0.48

    —

    <0.49

    —
    Q420

    <0.48

    一

    <0.50

    <0.48

    <0.52

    <0,48
    Q460

    <0.53

    <0.48

    W0.55

    <0.50

    <0.55

    W0.50
    Q500

    一

    <0.48

    一

    <0.50

    一

    W0.50
    Q550

    —

    <0.48

    .一

    <0.50

    一

    <0.50
    Q62O

    —

    <0.50

    —

    <0.52

    —

    W0.52
    Q690

    —

    		 <0.50

    —

    <0.52

    —

    W0.52

    Mechanical Property

    Mechanical properties of high-quality carbon steel structural steel and low-alloy high-strength structural steel pipes

    Grade Quality level Yield Strength Lower yield strength Elongation after breaking Impact test
     
    Nominal wall thickness temperature Absorb energy
    <16 mm >16 mm〜 〉30 mm
     
    30 mm
    not less than not less than
    10 — >335 205 195 185 24 — —
    15 — >375 225 215 205 22 — 一
    20 —— >410 245 235 225 20 — —
    25 — >450 275 265 255 18 — —
    35 — >510 305 295 285 17 一 —
    45 — 2590 335 325 315 14 — —
    20Mn —• >450 275 265 255 20 — 一
    25Mn — >490 295 285 275 18 — —
    Q345 A 470—630 345 325 295 20 — 一
    B 4~20 34
    C 21 0
    D -20
    E -40 27
    Q39O A 490—650 390 370 350 18    
    B 20 34
    C 19 0
    D -20
    E -40 27
    Q42O A 520〜680 420 400 380 18    
    B 20 34
    C 19 0
    D -20
    E -40 27
    Q46O C 550〜720 460 440 420 17 0 34
    D -20
    E -40 27
    Q500 C 610〜770 500 480 440 17 0 55
    D -20 47
    E -40 31
    Q550 C 670〜830 550 530 490 16 0 55
    D -20 47
    E -40 31
    Q62O C 710〜880 620 590 550 15 0 55
    D -20 47
    E -40 31
    Q690 C 770〜94。 690 660 620 14 0 55
    D -20 47
    E -40 31

    Mechanical properties of alloy steel pipes

    NO Grade Recommended heat treatment regime Tensile properties Annealed or high temperature tempered steel pipe Delivery condition Brinell hardness HBW
    Quenching (normalizing) Tempering Yield StrengthMPa Tensile Strength MPa Elongation after breaking A%
    temperature Coolant Temperature Coolant
    Frirst Second not less than no greater than
    1 40Mn2 840   Water, oil 540 Water, oil 885 735 12 217
    2 45Mn2 840   Water,oil 550 Water, oil 885 735 10 217
    3 27SiMn 920   Water 450 Water, oil 980 835 12 217
    4 40MnBc 850   oil 500 Water, oil 980 785 10 207
    5 45MnBc 840   oil 500 Water, oil 1 030 835 9 217
    6 20Mn2Bc’f 880   oil 200 Water, air 980 785 10 187
    7 20CrdJ 880 800 Water,oil 200 Water, air 835 540 10 179
    785 490 10 179
    8 30Cr 860   oil 500 Water, oil 885 685 11 187
    9 35Cr 860   oil 500 Water, oil 930 735 11 207
    10 40Cr 850   oil 520 Water, oil 980 785 9 207
    11 45Cr 840   oil 520 Water, oil 1 030 835 9 217
    12 50Cr 830   oil 520 Water, oil 1 080 930 9 229
    13 38CrSi 900   oil 600 Water, oil 980 835 12 255
    14 20CrModJ 880   Water,oil 500 Water, oil 885 685 11 197
    845 635 12 197
    15 35CrMo 850   oil 550 Water, oil 980 835 12 229
    16 42CrMo 850   oil 560 Water, oil 1 080 930 12 217
    17 38CrMoAld 940   Water, oil 640 Water, oil 980 835 12 229
    930 785 14 229
    18 50CrVA 860   oil 500 Water, oil 1 275 1 130 10 255
    19 2OCrMn 850   oil 200 Water、air 930 735 10 187
    20 20CrMnSif 880   oil 480 Water, oil 785 635 12 207
    21 3OCrMnSif 880   oil 520 Water, oil 1 080 885 8 229
    980 835 10 229
    22 35CrMnSiA£ 880   oil 230 Water、air 1 620   9 229
    23 20CrMnTie-f 880 870 oil 200 Water、air 1 080 835 10 217
    24 30CrMnTie*f 880 850 oil 200 Water、air 1 470   9 229
    25 12CrNi2 860 780 Water,oil 200 Water、air 785 590 12 207
    26 12CrNi3 860 780 oil 200 Water、air 930 685 11 217
    27 12Cr2Ni4 860 780 oil 200 Water、air 1 080 835 10 269
    28 40CrNiMoA 850 —— oil 600 Water、air 980 835 12 269
    29 45CrNiMoVA 860 — oil 460 oil 1 470 1 325 7 269
    a. Allowable adjustment range of heat treatment temperature listed in the table: quenching ± 15 ℃, low temperature tempering ± 20 ℃, high temperature tempering soil 50 ℃.b. In the tensile test, transverse or longitudinal samples can be taken. In case of disagreement, the longitudinal sample is used as the basis for arbitration.c. Boron-containing steel can be normalized before quenching, and the normalizing temperature should not be higher than its quenching temperature.d. Delivery according to a set of data specified by the demander. When the demander has not specified, delivery can be made according to any of the data.e. The first quenching of titanium steel with Ming Meng can be replaced by normalizing.f. Isothermal quenching at 280 C ~320 C.

    g. In the tensile test, if Rel cannot be measured, Rp0.2 can be measured instead of Rel.

     

    Tolerance

    Allowable deviation of outer diameter of steel pipe

    Type of steel pipe

    Allowable Tolerance

    Hot rolled steel pipe

    ± 1% D or ± 0.5, whichever is greater

    Cold drawn steel pipe

    Soil 0,75% D or soil 0.3, whichever is greater

     

    Allowable deviation of wall thickness of hot rolled (extended) steel pipe

    Type of steel pipe

    D

    S/D

    Allowable Tolerance

    Hot rolled steel pipe

    <102

    —

    ± 12.5% S or ± 0.4, whichever is greater

    >102

    <0.05

    ± 15% S or ± 0,4, whichever is greater

    >0.05 〜0.10

    ± 12.5% S or ± 0.4, whichever is greater

    >0.10

    + 12.5%S

    -10%S

    Heat expanded steel pipe

    一

    土 15%S

    Allowable deviation of wall thickness of cold drawn (rolled) steel pipe

    • Type of steel pipe

    S

    Allowable Tolerance

    Cold drawing (rolling)

    V

    + 15% S

    Or 0.15, whichever is greater

    —10% S

    >3 — 10

    + 12.5%S

    —10%S

    >10

    土 10%S

    Test Requirement

    Chemical composition,Stretch,Hardness,Shock,Squash,Bending,Ultrasonic testing,Eddy current,detection,Leak detection,Galvanized

    Product Detail

    Mechanical/Chemical&Fertilizer Pipes


    GB/T 8162-2008


    ASTM A519-2006


    BS EN 10210-1-2006


    ASTM A53/A53M-2012


    GB 9948-2006


    GB 6479-2013


    GB/T 17396-2009

    It truly is our responsibility to fulfill your requirements and successfully provide you. Your fulfillment is our best reward. We’re seeking forward in your check out for joint development for Hot-selling 30 Inch Seamless Structural Steel Pipe Seamless Carbon Steel Seamless Pipe, We warmly welcome domestic and overseas customers send inquiry to us ,we have 24hours working team! Anytime anywhere we are still here to be your partner.
    Hot-selling China Seamless Steel Pipes and Carbon Steel Seamless Pipe, Adhering to the principle of “Enterprising and Truth-Seeking, Preciseness and Unity”, with technology as the core, our company continues to innovate, dedicated to providing you with the highest cost-effective products and solutions and meticulous after-sales service. We firmly believe that: we have been outstanding as we’re specialized.

  • Previous:
  • Next:

    • Seamless Steel Tubes For Structural Purposes, Seamless Steel Tubes For Mechanical Structures In GB/8162-2008 Standard. In the seamless steel tube series, there is a kind of material called Q345B seamless steel tube is a low alloy series. In the low alloy material, this material is the most common. Q345 seamless steel tube is a kind of steel tube material. Q is the yield of this material, and 345 is the yield of this material, which is around 345. And the yield value will decrease with the increase of material thickness. Q345A level, is not impact; Q345B, is 20 degrees normal temperature impact; Q345C class, is 0 degree impact; Q345D, is -20 degree impact; Class Q345E, minus 40 degrees. The impact value is also different at different impact temperatures. Q345A, Q345B, Q345C, Q345D, Q345E. This is the grade of distinction, which represents, mainly impact temperature is different.

    Execution standard

    1. Seamless pipe for structure (GB/T8162-2018) is a seamless steel pipe for general structure and mechanical structure. 2. Seamless steel pipe for fluid transportation (GB/T8163-2018) is used for conveying water, oil, gas and other fluids in general seamless steel pipe. 3. Seamless steel tubes for low and medium pressure boilers (GB3087-2018) are high quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel tubes, which are used for manufacturing superheated steam pipes, boiling water pipes of various structures of low and medium pressure boilers and superheated steam pipes and arch brick pipes for locomotive boilers. 4. Seamless steel tube for high pressure boiler (GB5310-2018) is used for manufacturing high pressure and above pressure water tube boiler heating surface with high quality carbon steel, alloy steel and stainless heat resistant steel seamless steel tube.

    Q345B Seamless steel tube specification sheet

    specification

    specification

    specification

    specification

    14*3

    38*5.5

    89*5

    133*18

    14*3.5

    42*3

    89*5.5

    159*6

    14*4

    42*3.5

    89*6

    159*6.5

    16*3

    42*4

    89*7

    159*7

    18*2

    42*5

    89*7.5

    159*8

    18*3

    42*6

    89*8

    159*9.5

    18*4

    42*8

    89*9

    159*10

    18*5

    45*3

    89*10

    159*12

    19*2

    45*4

    89*11

    159*14

    21*4

    45*5

    89*12

    159*16

    22*2.5

    45*6

    108*4.5

    159*18

    22*3

    45*7

    108*5

    159*20

    22*4

    48*4

    108*6

    159*28

    22*5

    48*4.5

    108*7

    168*6

    25*2.5

    48*5

    108*8

    168*7

    25*3

    48*6

    108*9

    168*8

    25*4

    48*7

    108*10

    168*9.5

    25*5

    48.3*12.5

    108*12

    168*10

    25*5.5

    51*3

    108*14

    168*11

    27*3.5

    51*3.5

    108*15

    168*12

    27*4

    51*4

    108*16

    168*14

    27*5

    51*5

    108*20

    168*15

    27*5.5

    51*6

    114*5

    168*16

    28*2.5

    57*4

    114*6

    168*18

    28*3

    57*5

    114*7

    168*20

    28*3.5

    57*5.5

    114*8

    168*22

    28*4

    57*6

    114*8.5

    168*25

    30*2.5

    60*4

    114*9

    168*28

    32*2.5

    60*4

    114*10

    180*10

    32*3

    60*5

    114*11

    194*10

    32*3.5

    60*6

    114*12

    194*12

    32*4

    60*7

    114*13

    194*14

    32*4.5

    60*8

    114*14

    194*16

    32*5

    60*9

    114*16

    194*18

    34*3

    60*10

    114*18

    194*20

    34*4

    76*4.5

    133*5

    194*26

    34*4.5

    76*5

    133*6

    219*6.5

    34*5

    76*6

    133*7

    219*7

    34*6.5

    76*7

    133*8

    219*8

    38*3

    76*8

    133*10

    219*9

    38*3.5

    76*9

    133*12

    219*10

    38*4

    76*10

    133*13

    219*12

    38*4.5

    89*4

    133*14

    219*13

    38*5

    89*4.5

    133*16

    219*14

    219*16

    273*36

    356*28

    426*12

    219*18

    273*40

    356*36

    426*13

    219*20

    273*42

    377*9

    426*14

    219*22

    273*45

    377*10

    426*17

    219*24

    298.5*36

    377*12

    426*20

    219*25

    325*8

    377*14

    426*22

    219*26

    325*9

    377*15

    426*30

    219*28

    325*10

    377*16

    426*36

    219*30

    325*11

    377*18

    426*40

    219*32

    325*12

    377*20

    426*50

    219*35

    325*13

    377*22

    457*9.5

    219*38

    325*14

    377*25

    457*14

    273*7

    325*15

    377*32

    457*16

    273*8

    325*16

    377*36

    457*19

    273*9

    325*17

    377*40

    457*24

    273*9.5

    325*18

    377*45

    457*65

    273*10

    325*20

    377*50

    508*13

    273*11

    325*22

    406*9.5

    508*16

    273*12

    325*23

    406*11

    508*20

    273*13

    325*25

    406*13

    508*22

    273*15

    325*28

    406*17

    558.8*14

    273*16

    325*30

    406*22

    530*13

    273*18

    325*32

    406*32

    530*20

    273*20

    325*36

    406*36

    570*12.5

    273*22

    325*40

    406*40

    610*13

    273*25

    325*45

    406*55

    610*18

    273*28

    356*9.5

    406.4*50

    610*78

    273*30

    356*12

    406.4*55

    624*14.2

    273*32

    356*15

    406*60

    824*16.5

    273*35

    356*19

    406*65

    824*20

    Chemical Component

    Steel Grade

    Quality Level

    Chemical Composition

    C

    Si

    Mn

    P

    S

    Nb

    V

    Ti

    Cr

    Ni

    Cu

    Nd

    Mo

    B

    Als”

    No Greater Than

    Not Less Than

    Q345

    A

    0.2

    0.5

    1.7

    0.035

    0.035

    		      

    0.3

    0.5

    0.2

    0.012

    0.1

    ——

    —

    B

    0.035

    0.035

    C

    0.03

    0.03

    0.07

    0.15

    0.2

    0.015

    D

    0.18

    0.03

    0.025

    E

    0.025

    0.02
    A. In Addition To Q345A And Q345B Grades, The Steel Should Contain At Least One Of The Refined Grain Elements Al, Nb, V, And Ti. According To The Needs, The Supplier Can Add One Or More Refined Grain Elements. The Maximum Value Shall Be As Specified In The Table. When Combined, Nb + V + Ti Is Not More Than 0.22%B. For Q345, Q390, Q420 And Q46O Grades, Mo + Cr Is Not Greater Than 0.30%C. When Cr And Ni Of Each Grade Are Used As Residual Elements, The Content Of Cr And Ni Should Not Be Greater Than 0.30%; When It Is Necessary To Add, The Content Should Meet The Requirements In The Table Or Be Determined By The Supplier And The Buyer Through Consultation.D. If The Supplier Can Ensure That The Nitrogen Content Meets The Requirements In The Table, The Nitrogen Content Analysis May Not Be Performed. If Al, Nb, V, Ti And Other Alloy Elements With Nitrogen Fixation Are Added To The Steel, The Nitrogen Content Is Not Limited. The Nitrogen Fixation Content Should Be Specified In The Quality Certificate. E. When Using Full Aluminum, The Total Aluminum Content Alt ≥ 0020%.

     

    Grade

    Carbon Equivalent CEV (Mass Fraction) /%

    Nominal Wall Thickness S≤ 16mm

    Nominal Wall Thickness S2>16 Mm〜30 Mm

    Nominal Wall Thickness S>30mm

    Hot Rolled Or Normalized Normalized

    Quenching ＋Tempering

    Hot Rolled Or Normalized

    Quenching ＋Tempering

    Hot Rolled Or Normalized

    Quenching ＋Tempering

    Q345

    <0.45

    —

    <0.47

    —

    <0.48

    一

     

    Mechanical Property

    Mechanical Properties Of High-Quality Carbon Steel Structural Steel And Low-Alloy High-Strength Structural Steel Pipes

    Grade

    Quality Level

    Yield Strength

    Lower Yield Strength

    Elongation After Breaking

    Impact Test
     

    Nominal Wall Thickness

    Temperature

    Absorb Energy

    <16 Mm

    >16 Mm〜

    〉30 Mm
     

    30 Mm

    Not Less Than

    Not Less Than

    Q345

    A

    470—630

    345

    325

    295

    20

    —

    一

    B

    4~20

    34

    C

    21

    0

    D

    -20

    E

    -40

    27

     

    Test Requirement

    Chemical Composition: Stretch,Hardness,Shock,Squash,Bending,Ultrasonic Testing,Eddy Current,Detection,Leak Detection,Galvanized

    Q345B拼图(1)

    • Write your message here and send it to us
    Hit enter to search or ESC to close