GB6479-2000, Seamless steel tubes for high-pressure for chemical fertilizer equipments

 is a national standard specifies .  standard is applicable to High Pressure Seamless Pipe for For Chemical Fertilizer Equipment . GB9948 petroleum cracking tube seamless pipe is mainly used in the high temperature and high pressure fluid pipes mainly used for fertilizer equipment.

GB6479-2000-Seamless steel tubes for high-pressure for chemical fertilizer equipments

GB6479-2000(高压化肥设备用无缝钢管)。主要用于化肥设备上输送高温高压流体管道。

Application:

  • 用于高压化肥设备和管道用优质碳素钢、低合金钢和合金钢无缝钢管。
  • High quality carbon steel, low alloy steel and alloy steel seamless pipes for high pressure fertilizer equipment and pipeline.

主要钢级牌号 :、12Cr2Mo(经协商,也可供应其他特殊牌号的钢管)

The main chemical compositions(%) of GB6479-2000:

Grade C Si Mn Cr Mo
20# 0.17-0.24 0.17-0.37 0.35-0.65
16Mn 0.12-0.20 0.20-0.60 1.20-1.60
12CrMo 0.08-0.15 0.17-0.37 0.40-0.70 0.40-0.70 0.40-0.55
12Cr2Mo 0.08-0.15 ≤0.50 0.40-0.70 2.0-2.50 0.90-1.20

Mechanical Properties of GB6479-2000:

Grade Tesile
ób/MPa
Yield
ós/Mpa(min)
Elongation
δ5(%)(min)
SAFA
Aku/J(min)
Brinel hardness
HBS(max)
20# 410-550 245 21 39 -
16Mn 470-660 275-345 21 - -
12CrMo 410-560 205 21 55 156
12Cr2Mo 450-600 280 20 48(DVM样) -

The W.T. tolerance of GB6479-2000:

种类 尺寸/mm 允许偏差/mm 长度及允许偏差/m
热轧(扩)管 外径 ≤159
>159
±1.00%
±1.25%
4-12±O.02
壁厚 ≤20
>20
±12.5%
±10.0%
冷拔(轧)管 外径 ≤30
30-50
>50
±O.20%
±0.30%
±O.08%
3-10.5±O.02

Delivery condition:

Grade 热处理制度
20# 正火
16Mn 正火
12CrMo 900-930℃正火,670-720℃回火,保温时间:周期式炉大于2h,连续炉大于1h
12Cr2Mo 900-960℃正火,700-750℃回火,保温时间:大于1h

备注:

  • 允许一个试样的冲击值比表中规定数值低10J/cm2,但三个试样的算术平均值不小于表中规定值。
  • 用12Cr2Mo钢制造的钢管,当外径不大于30mm,壁厚不大于3mm时,其屈服点允许降低10MPa。其他牌号当壁厚大于16-40mm时,屈服点允许降低10MPa。

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PDF View the PDF catalogue of GB6479-2000 Standard specification

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