China Carbon Structure Steel Pipe Manufacturer and Supplier

Carbon Structure Steel 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.

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Product Detail

Product Tags

Our company exports structural steel pipes, China Seamless Pipe, China structure pipes, seamless steel pipe, structure pipes. Q345B material is a kind of structural steel pipe.

Q345 is a kind of steel material. It is a carbon alloy steel (c<0.2%) with good overall performance, good low temperature performance, cold stamping performance, welding performance and machinability. It is widely used in bridges, vehicles, ships, buildings, pressure vessels, etc. Q represents the yield of this material, and the latter 345 refers to the yield value of this material, which is around 345MPa. And as the thickness of the material increases, its yield value decreases.

Yield strength: ≤16mm: more than 345, 16-40mm: more than 335, 40-63mm:more than 325, 63-80mm: more than 315, 80-100m: more than 305, 100-150mm: more than 285, 150-200mm: more than 275.

Tensile strength: 450-630.

Elongation: more than 17.

Impact test: Test temperature: 20°C: more than 34.

Executive standard

1. Seamless steel pipe for structure (GB/T8162-2008) is a seamless steel pipe for general structure and mechanical structure.

2. Seamless steel pipe for fluid transportation (GB/T8163-2008) is a general seamless steel pipe used to transport water, oil, gas and other fluids.

3. Seamless steel pipes for low and medium pressure boilers (GB3087-2008) are high-quality carbon structural steel heat pipes used to manufacture superheated steam pipes, boiling water pipes for low and medium pressure boilers of various structures, and superheated steam pipes and arch brick pipes for locomotive boilers. Rolled and cold drawn (rolled) seamless steel tubes.

4. Seamless steel pipes for high-pressure boilers (GB5310-2008) are high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipes for the heating surface of water-tube boilers with high pressure and above.

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	0.20	0.50	1.70	0.035	0.035				0.30	0.50	0.20	0.012	0.10	——	—
	B				0.035	0.035
	C				0.030	0.030	0.07	0.15	0.20							0.015
	D	0.18			0.030	0.025
	E				0.025	0.020
Q390	A	0.20	0.50	1.70	0.035	0.035	0.07	0.20	0.20	0.3	0.50	0.20	0.015	0.10	—	—
	B				0.035	0.035
	C				0.030	0.030										0,015
	D				0.030	0.025
	E				0.025	0.020
Q42O	A	0.20	0.50	1.70	0.035	0.035	0.07	0.2	0.20	0.30	0.80	0.20	0.015	0.20	——	——
	B				0.035	0.035
	C				0.030	0.030										0.015
	D				0.030	0.025
	E				0.025	0.020
Q46O	C	0.20	0.60	1.80	0.030	0.030	0.11	0.20	0.20	0.30	0.80	0.20	0.015	0.20	0.005	0.015
	D				0.030	0.025
	E				0.025	0.020
Q500	C	0J8	0.60	1.80	0.025	0.020	0.11	0.20	0.20	0.60	0.80	0.20	0.015	0.20	0.005	0.015
	D				0.025	0.015
	E				0.020	0.010
Q550	C	0.18	0.60	2.00	0.025	0,020	0.11	0.20	0.20	0.80	0.80	0.20	0.015	0.30	0.005	0.015
	D				0.025	0,015
	E				0.020	0.010
Q62O	C	0.18	0.60	2.00	0.025	0.020	0.11	0.20	0.20	1.00	0.80	0.20	0.015	0.30	0.005	0.015
	D				0.025	0.015
	E				0.020	0.010
^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	Yield StrengthMPa	Tensile Strength MPa	Elongation after breaking A%
		Frirst	Second	Coolant	Temperature	Coolant	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
7	20CrdJ	880	800	Water,oil	200	Water, air	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
14	20CrModJ	880		Water,oil	500	Water, oil	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
17	38CrMoAld	940		Water, oil	640	Water, oil	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
21	3OCrMnSif	880		oil	520	Water, oil	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.}