GB/T 17396 27SiMn Hydraulic Prop Pipe

IMRI seamless hydraulic pillar pipe utilizes 27SiMn high-strength steel to deliver exceptional structural integrity in critical mining applications. Designed as the core component of hydraulic roof support systems, it ensures reliable performance under extreme static/dynamic loads up to 10,000 kN.

Grade	Chemical composition (mass fraction) %
Grade	C	Si	Mn	Cr	Ni	Mo	Cu	Nb	RE	P	S
35	0.32~0.39	0.17~0.37	0.50~0.80	≤0.25	≤0.25	一	≤0.20	—	一	≤0.025	≤0.015
45	0.42~0.50	0.17~0.37	0.50~0.80	≤0.25	≤0.25	一	≤0.20	—	—	≤0.025	≤0.015
27SiMn	0.24~0.32	1.10~1.40	1.10~1.40	≤0.30	≤0.30	≤0.10	≤0.20	—	—	≤0.025	≤0.015
27SiMnRE	0.24~0.32	1.10~1.40	1.10~1.40	≤0.30	≤0.30	≤0.10	≤0.20	—	0.008~0.025	≤0.025	≤0.015
30CrMnSi	0.28~0.34	0.90~1.20	0.80~1.10	0.80~1.10	≤0.30	≤0.10	≤0.20	—	—	≤0.025	≤0.015
30CrMo	0.26~0.33	0.17~0.37	0.40~0.70	0.80~1.10	≤0.30	0.15~0.25	≤0.20	—	一	≤0.025	≤0.015
30MnNbRE	0.27~0.36	0.20~0.60	1.20~1.60	0.30	≤0.30	0.10	≤0.20	0.020~0.050	0.008~0.025	≤0.025	≤0.015

Grade	Specimen heat treatment system				Tensile					Impact absorbed energy (KV₂) J	Tubes annealed condition Brinell hardness (HBW)
	Specimen heat treatment system				Tensile Strength/MPa	Lower yield strength or Specified plastic elongation strength/MPa			Post-break elongation%
	Q		N			WT (mm)
	Heating Temp ℃	Coolant	Heating Temp ℃	Coolant		≤16	>16<30	>30
	Heating Temp ℃	Coolant	Heating Temp ℃	Coolant	Not less than						not more than
35	一	一	一	一	510	305	295	285	17	一	一
45	—	—	一	一	590	335	325	315	14	一	—
27SiM	920±15	water	450±50	Water,oil	980	835			12	39	217
30CrMnSi	880±15	oil	540±50	Water,oil	1080	835			10	39	229
30CrMo	880±15	oil	540±50	Water,oil	930	735			12	71	229
30MnNbRE	880±15	wate	450±50	atmosphere	850	720			13	48	一

GB/T 17396 27SiMn Hydraulic Prop Pipe

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