China High Quality China ASME/API/GOST/DIN/En/JIS Seamless and Welded Steel Pipe Manufacturer and Supplier

High Quality China ASME/API/GOST/DIN/En/JIS Seamless and Welded 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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Overview

All we do is usually linked with our tenet " Shopper first, Rely on very first, devoting around the food packaging and environmental safety for High Quality Seamless and Welded Steel Pipe, We put genuine and health as the primary responsibility. Now we have a professional international trade crew which graduated from America. We've been your next enterprise partner. 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 meticulous after-sales service. We firmly believe that: we are outstanding as we are specialized.

Among the common structural seamless steel pipe materials, DIN1629 ST52 is one of the most commonly used materials. In Chinese standards, it usually corresponds to GB/T8162 Q345B. The two can be substituted for each other, but they are not completely corresponding. .

In terms of chemical composition:

DIN 1629 ST52: C: 0.17%max; P: 0.04%max; S:: 0.04%max; N: 0.009%max

GB/T 8162 Q345B: C: 0.2%max; P: 0.035%max; S:: 0.035%max; N: 0.012%max

It can be seen that the two standards jointly stipulate that the content of chemical elements is basically similar.

Mechanical performance:

DIN 1629 ST52: Tensile strength: 500~650Mpa; Yield strength: 335~355Mpa; Elongation (longitudinal): 21%min

GB/T 8162 Q345B: Tensile strength: 470~630Mpa; Yield strength: 295~345Mpa; Elongation (longitudinal): 20%min

The requirements for mechanical properties of the two are also roughly the same

Test items:

DIN 1629 requires tensile test, flattening test, tightness test, surface inspection, dimensional inspection; finished product analysis

GB/T8162 Q345B requires chemical composition inspection, tensile test, hardness test, 20℃ impact test, flattening test, bending test, non-destructive electrical test

It can be seen that the experimental project requirements of GB/T8162 Q345B basically cover DIN1629

Tolerance requirements:

DIN1629 stipulates:

OD tolerance：

OD≤100mm, ±1%or±0.5mm
100mm＜OD≤200mm, ±1%
OD＞200mm, ±1%
WT tolerance：

OD≤130mm: ≤2*standard WT: +15% -10%
2*standard WT＜s≤4*standard WT:+12.5% -10%
＞4*standard WT: ±9%
130mm＜OD≤320mm：≤0.05*standard WT:+17% -12.5%
0.05*standard WT＜s≤0.11*standard WT: ±12.5%
＞0.11*standard WT: ±10%
320mm＜OD≤660mm：≤0.05*standard WT: +20% -15%
0.05*standard WT＜s≤0.09*standard WT: +15% -12.5%
＞0.09*standard WT: +12.5% -10%

GB/T8162 stipulates:

OD tolerance:

±1% or ±0.5mm for the larger
WT tolerance:

OD≤102mm：±12.5% or ±0.4mm for the larger
OD＞102mm：WT≤0.05mm, ±15% or ±0.4mm for the larger
0.05mm＜WT≤0.1mm, ±12.5% or ±0.4mm for the larger
WT＞0.1mm, +12.5% -10%

The tolerances of the two are also roughly the same

Therefore, Q345B and ST52 can be substituted for each other when used in a normal environment and there is no special requirement. When the environment or requirements are more stringent, the comparison needs to be carefully considered.

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.}