Low and medium pressure boiler pipe GB/T 3087 grade 20 seamless steel tube

Standard: GB/T3087

The Chinese grade 20 seamless steel tube has different applications, one of them is for low and medium pressure boiler use. For such use, the excessive standard for the grade 20 seamless steel tube is GB/T 3087.

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The Chinese grade 20 seamless steel tube has different applications, one of them is for low and medium pressure boiler use. For such use, the excessive standard for the grade 20 seamless steel tube is GB/T 3087.

Low and medium pressure boiler pipe GB/T 3087 grade 20 seamless steel tube can be produced by hot rolling/hot squeezing/hot expanding, which is call hot-finished in general. And it can also be produced by cold drawing/cold rolling, which is call cold-finished in general.

Low and medium pressure boiler pipe GB/T 3087 grade 20 seamless steel tube chemical composition:

C, %	Mn, %	Si, %	P, %	S, %	Cr, %	Ni, %	Cu, %
0.17-0.23	0.35-0.65	0.17-0.37	0.035 max	0.035 max	0.25 max	0.30 max	0.25 max

Low and medium pressure boiler pipe GB/T 3087 grade 20 seamless steel tube mechanical properties:

Tensile Strength	Yield Strength	Elongation
410-550MPa	≥245MPa(WT≤16mm); ≥235MPa (WT>16mm)	≥20%

Wall thickness tolerance of GB/T 3087 grade 20 seamless steel tube:

Hot rolled (Hot squeeze)	Outside Diameter, mm	Tolerance
	OD≤102	±12.5%WT or ±0.40mm, choose the larger
	OD>102, WT/OD≤0.05	±15%WT or ±0.40mm, choose the larger
	OD>102, 0.05<WT/OD≤0.10	±12.5%WT or ±0.40mm, choose the larger
	OD>102, WT/OD>0.10	+12.5%WT, -10%WT
Hot expanded	±15%WT
Cold Drawn (Cold rolled)	Wall thickness, mm	Tolerance
	WT≤3	+15%/-10%WT or ±0.15mm,choose the larger
	WT>3	+12.5%WT, -10%WT

GB/T 3087 standard stipulates the order content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of the grade 20 seamless steel tube for boiler.

The delivery state of hot-finished GB/T 3087 grade 20 seamless steel tube shall be hot rolled or normalized. The delivery state of cold-finished GB/T 3087 grade 20 seamless steel tube shall be normalized.

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