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GB3087 steel pipe

GB5310 20G boiler steel pipe

GB3087-2008 is applicable to the seamless steel tubes that are made of quality carbon structural steels and used for manufacturing various low and medium pressure boilers.

低中压锅炉用无缝管(GB3087-2008)是用于制造各种结构低中压锅炉过热蒸汽管、沸水管及机车锅炉用过热蒸汽管、大烟管、小烟管和拱砖管用的优质碳素结构钢热轧和冷拔(轧)无缝管。

GB3087-2008《低中压锅炉用无缝钢管》规定。各种结构锅炉用钢管规格,外径10-426mm,共计43种。壁厚1.5-26mm共计29种。

GB3087-2008《低中压锅炉用无缝钢管》和GB5310-2008《高压锅炉用无缝钢管》的规定。外观质量:钢管内外表面不允许有裂缝、折叠、轧折、结疤、离层和发纹。这些缺陷应完全清除掉。清除深度不得超过公称壁厚的负偏差,其清理处实际壁厚不得小于壁厚所允许的最小值。

主要钢级牌号 : Grade10, 20 (经协商,也可供应其他特殊牌号的钢管)

化学成分(%):
钢级 C Mn Si Cr(max) Ni(max) Cu(max) P.S(max)
10 0.07-0.14 0.35-0.65 0.17-0.37 0.15 0.3 0.2 0.03
20 0.17-0.24 0.35-0.65 0.17-0.37 0.25 0.25 0.2 0.03
机械性能:
钢级 抗拉强度 (MPa) 屈服强度Mpa(min) 伸长率 (%)(min)
10 335-475 195 24
20 410-550 245 20
尺寸偏差:
钢管种类 钢管尺寸 允许偏差
mm 普通级 高级
热轧(挤)管 外径(D) ≤159   +/- 1.0%(最小值为+0.50mm)  +/- 1.0%(最小值为+0.5mm)
>159 1.00%   +/- 1%
壁厚(S) ≤20   +15%(最小值为+0.45mm) +1.0%(最小值为+0.30mm)
-12.5%(最小值为-0.35mm)
>20 12.50%   +/- 10%
D≥351热扩钢管 15%
冷拔(轧)管 外径(D)   10-30 +0.40mm   +/- 0.20mm
30-50 +0.45mm   +/- 0.25mm
>50 1.00%  +/- 0.75%
壁厚(S) 1.5-3.0 15%  +/- 10%
-10%
>3.0 12.50%  +/- 10%
-10%


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