GB 6479 16Mn 1Seamless Steel Tubes For High-pressure Chemical Fertilizer Equipments
GB6479 High-pressure Chemical Fertilizer Equipments Seamless Steel Tubes
Application:Seamless steel tubes of best quality carbon steel ,low alloy steel and stainless steel for high-pressure chemical fertilizer equipment and piping as well as for other chemical equipment.
OD:14-426mm WT:0.5-45mm Length:4-12m
Manufacture method:The manufacture method of steel and tube blank shall meet what specified in YB/T 5137.Steel tubes shall be manufacturd by seamless method of hot rolling (extrude pressing,expansion)or cold drawn(rolling). In case the demander assigns one manufacture method,it shall be specified in the contract.
Allowable Deviation of OD and Wall Thickness
| Type of steel | Size of steel tube | Allowable deviation | ||
| Common class | High class | |||
| Hot rolled (Extrude pressed) Steel tube
| OD,D | ≤159 | ±1.0%(Minimum value is ±0.5mm) | ±0.75%(Minimum value is ±0.3mm) |
| ＞159 | ±1.0% | ±0.90% | ||
| Wall thickness,S |
≤20
＞20
| +15% -10%
+12.5% -10.0% |
±10%
±10% | |
| Cold drawn (rolled)steel tubes | OD,D | 14~30 ＞30~50 ＞50 | ±0.20mm ±0.30mm ±0.75% | ±0.15mm ±0.25mm ±0.6% |
| Wall thickness | ≤3.0 | +12.5% -10% | ±10% | |
| ＞3.0 | ±10% | ±7.5% | ||
| Note:Allowable deviation for OD of hot expanded steel tubes is ±1.0%,allowable deviation for wall thickness is±15%. | ||||
Brand Number and Chemical Composition of Steel
| Brand number | Chemical composition,% | ||||||||||
| C | Si | Mn | Cr | Mo | V | W | Nb | Ni | P | S | |
| Not more than | |||||||||||
| 10 | 0.07~ 0.14 | 0.17~ 0.37 | 0.35~ 0.65 | 0.030 | 0.030 | ||||||
| 20 | 0.07~ 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 | ||||||
| 15MnV | 0.12~ 0.18 | 0.20~ 0.60 | 1.20~ 1.60 | 0.04~ 0.12 | 0.030 | 0.030 | |||||
| 10MoWVNb | 0.07~ 0.13 | 0.50~ 0.80 | 0.50~ 0.80 | 0.60~ 0.90 | 0.30~ 0.50 | 0.50~ 0.90 | 0.06~ 0.12 | 0.030 | 0.030 | ||
| 12CrMo | 0.08~ 0.15 | 0.17~ 0.37 | 0.40~ 0.70 | 0.40~ 0.70 | 0.40~ 0.55 | 0.030 | 0.030 | ||||
| 15CrMo | 0.12~ 0.18 | 0.17~ 0.37 | 0.40~ 0.70 | 0.80~ 1.10 | 0.40~ 0.55 | 0.030 | 0.030 | ||||
| 1Cr5Mo | ≤0.15 | ≤0.50 | ≤0.60 | 4.00~ 6.00 | 0.45~ 0.60 | ≤0.60 | 0.030 | 0.030 | |||
| 12Cr2Mo | 0.80~0.15 | ≤0.50 | 0.40~ 0.70 | 2.0~ 2.50 | 0.90~1.20 | 0.030 | 0.030 | ||||
| 12SiMoVNb | 0.08~ 0.14 | 0.50~ 0.80 | 0.60~ 0.90 | 0.90~ 1.10 | 0.30~ 0.50 | 0.04~ 0.08 | 0.030 | 0.030 | |||
| Brand number | Residual element,% ≯ | ||||
| Ni | Cr | Cu | Mo | V | |
| 10 | 0.25 | 0.15 | 0.20 | - | - |
| 20 | 0.25 | 0.25 | 0.20 | 0.15 | 0.08 |
| Others | 0.30 | 0.30 | 0.20 | - | - |
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