Pipe for chemical equipment

Implement GB 9948, GB 6479 for seamless steel tube & pipe used for pressure pipes such as petroleum and chemical furnaces, refineries, crackers, hydrogen units, heat exchangers etc.

Usage	Steel Grade	Specification
Pipe used for Petroleum Cracking	20, 12CrMo, 15CrMo, 12Cr2Mo, 12Cr1MoV,	GB 9948
	12Cr5MoI, 12Cr5MoNT, 12Cr9MoI, 12Cr9MoNT,
Pipe used for High Pressure	20, Q345B, Q345C, Q345D, Q345E, 12CrMo,	GB 6479
Chemical Fertilizer Equipment	15CrMo, 12Cr2Mo, 12Cr5Mo, 10MoWVNb

Mechanical properties for GB 9948 Seamless steel pipe

Standard	Gade	tensile strength (MPa)	yield strength (MPa)	elongation (%)	impact energy (J)	Brinell hardness (HB)	delivery status
GB9948	10	330-490	≥205	≥24	/	/	Normalizing
	20	410-550	≥245	≥21	≥39	/	Normalizing
	15CrMo	440-640	≥235	≥21	≥47	≤170	Normalizing + tempering
	1Cr2Mo	≥390	≥175	≥22	≥92	≤179	Normalizing + tempering
	1Cr5Mo	≥390	≥195	≥22	≥92	≤187	annealing

Chemical composition for GB 9948 Seamless steel pipe

Gade	C	Si	Mn	P	S	Cr	Mo	Ni
10	0.07-0.14	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.15	/	≤0.25
20	0.17-0.24	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.25	/	≤0.25
15CrMo	0.12-0.18	0.17-0.37	0.40-0.70	≤0.035	≤0.035	0.80-1.10	0.40-0.55	≤0.30
1Cr2Mo	≤0.15	0.50-1.00	0.30-0.60	≤0.035	≤0.030	2.15-2.85	0.45-0.65	/
1Cr5Mo	≤0.15	≤0.50	≤0.60	≤0.035	≤0.030	4.00-6.00	0.45-0.60	≤0.60

General GB 9948 seamless steel pipe use temperature below 450 ° C, domestic pipe is mainly made of 10, 20 carbon steel hot-rolled pipe or cold drawn pipe.

Chemical Component of GB6479-2013

Chemical Component/%
Grade	C	Si	Mn	Cr	Mo	V	W	Nb	Ni	P S
										No More Than
10	0. 07-0. 13	0. 17 -0. 37	0.35 -0. 65	-	-	-	-	-	-	0.025	0.015
20	0. 17 -0. 23	0.17 -0. 37	0. 35-0.65	-	-	-	-	-	-	0.025	0.015
Q345Ba	0. 12 -0. 20	0.20-0. 50	1.20-1.70	<0. 30	<0. 10	Mis	-	<0.07	W0. 50	0.025	0.015
Q345C"	0. 12 -0. 20	0.20 -0. 50	1.20 -1. 70	W0. 30	<0. 10	<0. 15	-	W0.07	<0. 50	0.025	0.015
Q345D"	0. 12 -0. 18	0.20 -0. 50	1. 20-1.70	W0. 30	<0. 10	<0. 15	-	W0.07	<0. 50	0. 025	0.015
Q345Ea*B	0. 12 -0. 18	0. 20-0. 50	1. 20 -1.70	W0. 30	<0. 10	<0. 15	-	<0.07	<0. 50	0. 025	0.01
12CrMo	0. 08-0. 15	0.17 -0. 37	0. 40-0. 70	0. 40-0. 70	0. 40-0. 55	-	-	-	-	0. 025	0.015
15CrMo	0. 12 -0. 18	0. 17 -0. 37	0. 40-0. 70	0. 80-1. 10	0. 40-0.55	-	-	-	-	0. 025	0. 015
12Cr2Mo	0. 08-0. 15	<0. 50	0. 40-0.6	2.00-2. 50	0. 90-1. 13	-	-	-	-	0.025	0. 015
12Cr5Mo	<0. 15	<0.50	<0. 60	4. 00-6.00	0. 40-0. 60	-	-	-	<0. 60	0. 025	0. 015
LOMoWVNb	0. 07-0. 13	0. 50-0.8	0. 50-0.8	-	0. 60-0. 90	0. 30-0. 50	0. 50-0. 90	0. 06-0. 12	-	0.025	0.015
12SiMoVNb	0.08 -0. 14	0.50 -0.8	0. 60-0. 90	-	0. 90-1. 10	0. 30-0. 50	-	0. 04-0.08	-	0.025	0.015

Awhen It Is Necessary To Add Fine Grain Elements, The Steel Shall Contain At Least One Of Al, Nb, V And Ti. The Added Fine Grain Elements Shall Be Indicated In The Quality Certificate. Ti Content Shall Not Be More Than 0.20%

BAl Content In Steel Shall Not Be Less Than 0.020%, Or Ala Content In Steel Shall Not Be Less Than 0.015%

Mechanical Property of GB6479-2013

Mechanical Property
Grade	Tensile	Yield			Elong After Fracture A/%		Reduction Of Area	Shork Absorption Energy
	MPa	MPa					Z/%	（KV2）/J
		Steel Tube Wall Thickness/Mm						Test Temperature/℃	Portrait	Transver
		W16	>16 — 40	>40	Portrait	Transver
		Not Less Than							Not Less Than
10	335-490	205	195	185	24	22	一	一	—	一
20	410-550	245	235	225	24	22	一	0	40	27
Q345B	490-670	345	335	325	21	19	一	20	40	27
Q345C	490-670	345	335	325	21	19	一	0	40	27
Q345D	490-670	345	335	325	21	19	一	-20	40	27
Q345E	490-670	345	335	325	21	19	—	-40	40	27
12CrMo	410-560	205	195	185	21	19	—	20	40	27
15CrMo	440-640	295	285	275	21	19	一	20	40	27
12Cr2Moa	450-600	280			20	18	一	20	40	27
12Cr5Mo	390-590	195	185	175	22	20	一	20	40	27
LOMoWVNb	470-670	295	285	275	19	17	一	20	40	27
12SiMoVNb	2470	315	305	295	19	17	50	20	40	27

Test requirement

In addition to ensuring the chemical composition and mechanical properties, the steel pipe directly rolled by ingot shall be subject to low power inspection, and eddy current inspection.