Application of JIS G 3441 Alloy Seamless Steel Tubes
Pipe ordered under this specification for machinery, automobiles and other machine parts.Details of JIS G 3441 Alloy Seamless Steel Tubes We can supply
Manufacture:seamless pipe (hot finished and cold finished) Size: O.D.: 15.0～114mm W.T.: 2～20mm Grade: SCM 415TK,SCM 420 TK. Length: 6M or specified length as required. Ends: Plain End, Beveled End.Manufacturing Process of JIS G 3441 Alloy Seamless Steel Tubes
By a seamless process: hot finished and cold finished (with annealed)Chemical Composition and mechanical properties JIS G3441 Alloy Seamless Steel tubes
Grade and Chemical Composition (％)| Grade | C≤ | Si | Mn | P≤ | S≤ | Cr | Mo |
| SCM 420TK | 0.18~ 0.23 | 0.15~ 0.35 | 0.60~ 0.85 | 0.030 | 0.030 | 0.90~ 1.20 | - |
| SCM 415TK | 0.13~ 0.18 | 0.15~ 0.35 | 0.60~ 0.85 | 0.030 | 0.030 | 0.90~ 1.20 | 0.15~ 0.30 |
| SCM 418TK | 0.16~ 0.21 | 0.15~ 0.35 | 0.60~ 0.85 | 0.030 | 0.030 | 0.90~ 1.20 | 0.15~ 0.30 |
| SCM 420TK | 0.18~ 0.23 | 0.15~ 0.35 | 0.60~ 0.85 | 0.030 | 0.030 | 0.90~ 1.20 | 0.15~ 0.30 |
| SCM 430TK | 0.28~ 0.33 | 0.15~ 0.35 | 0.60~ 0.85 | 0.030 | 0.030 | 0.90~ 1.20 | 0.15~ 0.30 |
| SCM 435TK | 0.33~ 0.38 | 0.15~ 0.35 | 0.60~ 0.85 | 0.030 | 0.030 | 0.90~ 1.20 | 0.15~ 0.30 |
| SCM 440TK | 0.38~ 0.43 | 0.15~ 0.35 | 0.60~ 0.85 | 0.030 | 0.030 | 0.90~ 1.20 | 0.15~ 0.30 |
| Note: 1. Ni as an impurity in various steel pipes does not exceed 0.25%, and Cu does not exceed 0.30%; 2. When the purchaser requests the analysis of the finished product, the allowable deviation is as specified in Table 3 of JIS G0321. | |||||||
Tolerance of outside diameter and wall thickness
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- Tolerance of OD and W.T
Division
Tolerance on O.D
Tolerance on W.T
Class 1
D＜50m
±0.5 mm
S＜4mm
+0.6mm
-0.5mm
50mm≤D
±1%
S≥4mm
+1% -12.5%
Class 2
D＜50m
±0.25mm
S＜3mm
±0.3mm
50mm≤D
±0.5%
S≥3mm
±10%
Class 3
D＜25m
±0.12 mm
S＜2mm
±0.15mm
40mm＞D≥25mm
±0.15 mm
50mm＞D≥40mm
±0.18 mm
S≥2mm
±8%
60mm＞D≥50mm
±0.20 mm
Notes: tolerance on each wall thickness shall be rounded off to one decimal place in accordance with rule a JIS Z 8401
70mm＞D≥60mm
±0.23mm
80mm＞D≥70mm
±0.25 mm
90mm＞D≥80mm
±0.30mm
100mm＞D≥90mm
±0.40 mm
D≥100mm
±0.50%
1. The OD tolerance of hot finish seamless steel pipe according to Class1 2. Quenched and tempered steel pipes according to 4 categories.
- Tolerance of OD and W.T
Appearance for JIS G3441 Alloy Seamless Steel tubes
The steel pipe shall be straight and the both ends should be cut in perpendicular; there shall be no defects on the surface that are harmful to the use; When there are special requirements for pipe surface processing, the supplier and the buyer agree.Delivery Condition
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- In principle, it should be in manufacturing condition, or a cold finish condition, or an annealing condition. Other heat treatments are available upon request
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Marking
Grade Manufacture method code(hot finished seamless steel pipe: S-H; Cold finished seamless steel pipe: S-C) Dimensions(nominal diameter X nominal wall thickness or outside diameter X wall thickness) Manufacturer's name or its identifying brandPacking for JIS G3441 Alloy Seamless Steel tubes
Bare pipe, black coating ( customized); 6" and below sizes In bundles with two cotton slings, other sizes in loose; Both ends with end protectors; Plain end, bevel end; Marking.