Seamless steel tubes for coal mining- GB/T 17396-2009

Product Detail

Overview

Application

Seamless steel pipe for coal mine is mainly used to manufacture seamless pipe for hydraulic prop in coal mine.

Main Grade

Grade of high-quality carbon structural steel: 20#、35#

Chemical Component

	C	Si	Mn	Nb	RE	Cr	Ni	Cu	Mo	P	S
20	0.17-0.23	0.17-0.37	0.35-0.65	一	一	<0. 25	<0. 25	<0. 20	一	<0. 035	<0. 035
35	0.32-0.39	0.17—0. 37	0. 50一0.8	一	一	<0. 25	<0. 25	<0. 20	一	<0. 035	<0. 035
45	0.42-0.50	0.17 一0. 37	0.50 一0.8	一	一	<0. 25	WO. 25	WO. 20	一	<0. 035	<0. 035
27SiMn	0.24-0.32	1.10 一1.4	1.10 一1.4	一	一	W0. 30	<0.30	<0. 20	<0.15	<0. 035	<0. 035
30MnNbREa	0.27-0.36	0. 20一0. 60	1.20 一1. 60	0.020一0. 050	0. 02一0. 04	<0.30	<0.30	<0. 20	<0.15	<0. 035	<0. 035
a The content of re is calculated as 0.02% ~ 0.04% added to the molten steel.

Mechanical Property

Mechanical Property
Grade	Tensile strength	Yield			Elong after fracture	Reduction of area	Shork absorption energy （KV2）/J
	Rm/MPa	MPa			A/%	Z/%
		Steel tube wall thickness/mm
		<16	>16 〜30	>30
	no more less
20	410	245	235	225	20	—
35	510	305	295	285	17	—	—
45	590	335	325	315	14	—	—
27SiMn	980	835			12	40	39
30MnNbRE	850	720			13	45	48

Test Requirement

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