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Seamless steel tubes for high-pressure chemical fertilizer processmg equipmentStandard：
GB6479 Chinese national standard
Application：
Seamless steel tubes for high-pressure chemical fertilizer processing equipment and pipelines thereof
Model No．of steel tubes：
10、20、16Mn、10MoWVNb、15CrMo、1Cr5Mo、12 Cr2Moetc
.Diamensional tolerances:
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Cold-rolled tubes | Tube sizes(mm) | Tolerances(mm) | Tube sizes (mm) | Tolerances(mm) |
＞30～50 | ±0.3 | ≤30 | ±10％ | |
＞50～219 | ±0.8％ | |||
Hot-rolled tubes | ＞219 | ±1.0％ | ＞20 | ±10％ |
Mechanical properties：
标准 | 牌号 | 抗拉强度（MPa） | 屈服强度（MPa） | 伸长率（％） | 冲击功（J） | 低温冲击Akv |
GB6479 | 10 | 335～490 | ≥205 | ≥24 | / | －20℃≥18 |
20 | 410～550 | ≥245 | ≥24 | ≥39 | －20℃≥18 | |
16Mn | 490～670 | ≥320 | ≥21 | ≥47 | －40℃≥21 | |
10MoWVNb | 470～670 | ≥295 | ≥19 | ≥62 | ||
15CrMo | 440～640 | ≥235 | ≥21 | ≥47 | ||
1Cr5Mo | 390～590 | ≥195 | ≥22 | ≥94 | ||
12 Cr2Mo | 450～600 | ≥280 | ≥20 | ≥38 |
Chemical composition:
Standard codes | Models of steel tubes | Chemical compositions（％） | |||||||
C | Si | Mn | P | S | Cr | Mo | Ni | ||
GB 6479 | 10 | 0.07～0.14 | 0.17～0.37 | 0.35～0.65 | ≤0.030 | ≤0.030 | / | / | / |
20 | 0.17～0.24 | 0.17～0.37 | 0.35～0.65 | ≤0.030 | ≤0.030 | / | / | / | |
16Mn | 0.12～0.20 | 0.20～0.60 | 1.20～1.60 | ≤0.030 | ≤0.030 | ||||
10MoWVNb | 0.07～0.13 | 0.50～0.80 | 0.50～0.80 | ≤0.030 | ≤0.030 | / | 0.60～0.90 | / | |
15CrMo | 0.12～0.18 | 0.17～0.37 | 0.40～0.70 | ≤0.030 | ≤0.030 | 0.80～1.10 | 0.40～0.55 | / | |
1Cr5Mo | ≤0.15 | ≤0.50 | ≤0.60 | ≤0.030 | ≤0.030 | 4.00～6.00 | 0.45～0.60 | ≤0.60 | |
12 Cr2Mo | 0.80～0.15 | ≤0.50 | 0.40～0.70 | ≤0.030 | ≤0.030 | 2.0～2.50 | 0.90～1.20 | ||
NOTE：the residual contents of the elements for the steel 10:Ni≤0.25％、Cr≤0.15％、Cu≤0.20％
the residual contents of the elements for the steel 20:Ni≤0.25％、Cr≤0.25％、Cu≤0.20％、Mo≤0.15％、V≤0.08％
the residual contents of the elements for the steel Ni≤0.30％、Cr≤0.30％、Cu≤0.20％
