China High quality carbon structural steel, alloy structural steel and stainless heat resistant steel high pressure seamless pipe for steam boiler pipelines under high pressure and above pressure Manufacturer and Supplier

High quality carbon structural steel, alloy structural steel and stainless heat resistant steel high pressure seamless pipe for steam boiler pipelines under high pressure and above pressure

Short Description:

Manufacturing method:

(1) General GB9948 seamless steel pipe temperature is below 450℃, domestic pipe is mainly made of no. 10, 20 carbon bonded steel hot rolled pipe or cold drawn pipe.

②GB9948 seamless steel pipe is often used in high temperature and high pressure conditions, the pipe under the action of high temperature flue gas and water vapor, oxidation and corrosion will occur.The steel pipe is required to have high durable strength, high oxidation corrosion resistance and good microstructure stability.

(2) use:

(1) General GB9948 seamless steel pipe is mainly used to manufacture water-cooled wall pipe, boiling water pipe, superheated steam pipe, locomotive boiler superheated steam pipe, large and small smoke pipe and arch brick pipe.

②GB9948 seamless steel tube is mainly used to manufacture superheater tube, reheater tube, pipe, main steam pipe and so on of high pressure and ultra-high pressure boiler.

GB9948 seamless steel tube according to the high temperature performance is divided into general boiler tube and high pressure boiler tube.Whether general boiler tube or high pressure boiler tube can be divided into various steel tubes according to different requirements of its use.

Specifications and appearance quality

(1)GB3087-2008 “Seamless Steel pipe for Low and medium pressure boiler” provisions.Specifications of steel tubes for various structural boilers, diameters 10 ~ 426mm, 43 kinds in total.There are 29 kinds of wall thickness from 1.5 mm to 26mm.However, the outer diameter and wall thickness of superheated steam pipe, large smoke pipe, small smoke pipe and arch brick pipe used in locomotive boiler are stipulated otherwise.

(2)GB5310-2008 “Seamless Steel Tube for High pressure Boiler” hot rolled pipe diameter 22 ~ 530mm, wall thickness 20 ~ 70mm.Cold drawn (cold rolled) tube diameter 10 ~ 108mm, wall thickness 2.0 ~ 13.0mm.

(3)GB3087-2008 “seamless steel tube for low and medium pressure boiler” and GB5310-2008 “seamless steel tube for high pressure boiler” provisions.Appearance quality: cracks, folding, rolling, scarring, separation and wrinkles are not allowed on the inner and outer surface of the steel pipe.These defects should be eliminated completely.The clearance depth shall not exceed the negative deviation of the nominal wall thickness, and the actual wall thickness at the clearance shall not be less than the minimum allowable wall thickness.

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.

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Product Detail

Product Tags

Overview

Standard: GB9948-2006

Grade Group: 10、12CrMo、15CrMo, 07Crl9Nil0, 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

Heat Treatment: Annealing/normalizing/Tempering

Outer Diameter(Round): 10 - 1000 Mm

Application: heat exchange tubes

Surface Treatment: As Customer's Requirement

Technique: Hot Rolled

Special Pipe: Thick Wall Pipe

Usage: heat exchange tubes

Test:UT/MT

Application

Seamless steel tubes for petroleum cracking are applicable to seamless steel tubes for furnace tubes, heat exchange tubes and pressure pipes in petrochemical industry.

High quality carbon structural steel grades are 20g, 20mng and 25mng.
Alloy structural steel grades: 15mog, 20mog, 12crmog
15CrMoG、12Cr2MoG、12CrMoVG, etc

Main Grade

Grade of high-quality carbon structural steel: 10#、20#

High quality carbon structural steel grades : 20g, 20mng and 25mng

Alloy structural steel grades: 15mog, 20mog, 12crmog, 15CrMoG、12Cr2MoG,etc

Chemical Component

No	Grade	Chemical Component %
		C	Si	Mn	Cr	Mo	Ni	Nb	Ti	V	Cu	P	S
												≤
High quality carbon structural steel	10	0. 07-0.13	0.17 -0. 37	0.35 -0.65	<0.15	<0.15	<0. 25	—	—	<0. 08	<0. 20	0. 025	0. 015

	20	0.17-0. 23	0.17 -0. 37	0.35 -0.65	<0. 25	<0.15	<0. 25	—	—	<0. 08	<0. 20	0. 025	0. 015

Alloy structural steel	12CrMo	0. 08-0.15	0.17 -0.37	0. 40-0. 70	0. 40-0. 70	0. 40 -0.55	<0. 30	—	—	一	<0. 20	0. 025	0. 015

	15CrMo	0.12 -0.18	0.17-0. 37	0.40 -0. 70	0. 80-1.1	0. 40-0.55	<0. 30	—	—	一	<0. 20	0. 025	0. 015

	12CrlMo	0. 08 -0.15	0.50 -1. 00	0. 30-0.6	1.00-1. 50	0.45 -0.65	<0. 30	—	—	—	<0, 20	0. 025	0. 015

	12CrlMoV	0. 08-0.15	0.17-0. 37	0. 40-0. 70	0.90-1.2	0. 25 -0.35	<0. 30	—	—	0.15 -0. 30	<0. 20	0.025	0. 010

	12Cr2Mo	0.08-0.15	<0. 50	0. 40-0. 60	2. 00-2. 50	0. 90-1.13	<0. 30	—	—	一	<0. 20	0. 025	0. 015

	12Cr5MoI	<0.15	<0. 50	0.30-0.6	4. 00-6	0. 45 -0. 60	<0. 60		—	—	<0. 20	0. 025	0. 015
	12Cr5MoNT
	12Cr9MoI	<0.15	0. 25-1. 00	0. 30-0. 60	8.00 -10. 00	0. 90-1.1	<0. 60	—	—	—	<0. 20	0. 025	0, 015
	12Cr9MoNT
Stainless heat resistant steel	07Crl9Nil0	0. 04-0.1	<1. 00	<2. 00	18. 00-20. 00	—	8. 00-11	—	—	—	—	0. 030	0. 015

	07Crl8NillNb	0. 04-0.1	<1. 00	<2. 00	17. 00-19. 00	—	9.00-12. 00	8C-1.1	—	—	—	0. 030	0. 015

	07Crl9NillTi	0. 04-0.1	<0. 75	<2. 00	17.00-20. 00	—	9. 00~13. 00	—	4C-0. 60	一	一	0.03	0. 015

	022Crl7Nil2Mo2	<0. 030	<1. 00	<2. 00	16. 00-18. 00	2. 00-3. 00	10. 00 -14. 00	—	一	一	—	0.03	0. 015

Mechanical Property

No	Tensile MPa	Yield MPa	Elong after fracture A/%		Shork absorption energy kv2/j		Brinell hardness number
		Yield MPa	portrait	transver	portrait	transver	Brinell hardness number
		not less than					no more than
10	335〜475	205	25	23	40	27
20	410〜550	245	24	22	40	27
12CrMo	410〜560	205	21	19	40	27	156 HBW
15CrMo	440〜640	295	21	19	40	27	170 HBW
12CrlMo	415〜560	205	22	20	40	27	163 HBW
12CrlMoV	470〜640	255	21	19	40	27	179 HBW
12Cr2Mo	450~600	280	22	20	40	27	163 HBW
12Cr5MoI	415〜590	205	22	20	40	27	163 HBW
12Cr5MoNT	480〜640	280	20	18	40	27	—
12Cr9MoI	460〜640	210	20	18	40	27	179 HBW
12Cr9MoNT	590—740	390	18	16	40	27
O7Crl9NilO	2520	205	35				187 HBW
07Crl8NillNb	>520	205	35			—	187 HBW
07Crl9NillTi	>520	205	35		—	—	187 HBW
022Crl7Nil2Mo2	>485	170	35		一	—	187 HBW
For steel with wall thickness less than 5mm tube do not make hardness experiment

Test Requirement

Hydraulic test
Hydraulic test shall be carried out for steel pipes one by one. The maximum test pressure is 20 MPa. Under the test pressure, the stabilization time shall not be less than 10 s, and leakage of steel pipe is not allowed.
Flattening test
Flattening test shall be conducted for steel pipe with outer diameter greater than 22 mm
Flaring test
High quality carbon structural steel and stainless (heat-resistant) steel pipes with an outer diameter of not more than 76 mm and a wall thickness of not more than 8 mm shall be subject to expanding test. The flaring test shall be carried out at room temperature. The outer diameter flaring rate of the sample after the top core taper is 60% of the flaring shall meet the requirements of table 7. No cracks or cracks are allowed on the sample after the flaring. According to the requirements of the demander and noted in the contract, the alloy structural steel can also be used for expanding test.
Nondestructive teste
The steel pipes shall be subject to ultrasonic flaw detection one by one in accordance with the provisions of GB / T 5777-2008. According to the requirements of the demander, other non-destructive tests can be added after negotiation between the supplier and the demander and indicated in the contract.
Intergranular corrosion test
Intergranular corrosion test shall be conducted for stainless (heat-resistant) steel pipe. The test method shall be in accordance with the provisions of Chinese method E in GB / T 4334-2008, and intergranular corrosion tendency is not allowed after the test.
After negotiation between the supplier and the demander, and noted in the contract, the demander can designate other corrosion test methods.