JIS G3441 alloy steel tubes are widely used in mechanical structure, natural gas, oil, water transportation, chemical fertilizer equipment with boiler ect.
Application ofJIS G3441 alloy steel tubes:
mechanical structure, natural gas, oil, water transportation, chemical fertilizer equipment with boiler, petroleum cracking, geological drilling, oil drilling, etc.
Quality Standard and Steel Grade:
- JIS G3441 SCr420TK
- JIS G3441 SCM415TK
- JIS G3441 SCM418TK
- JIS G3441 SCM420TK
- JIS G3441 SCM430TK
- JIS G3441 SCM435TK
- JIS G3441 SCM440TK
Size range of JIS G3441 Alloy Steel Tubes:
Tolerance on Outside Diameter in JIS G3441
O.D.(mm) | Tolerance(%) |
<13 td> | ±0.25 |
<13-25 | ±0.40 |
<25-40 | ±0.60 |
<40-65 | ±0.80 |
<65-90 | ±1.00 |
<90-140 | ±1.20 |
<140 | By agreement |
Tolerance on Wall Thickness in JIS G3441
W.T.(mm) | Tolerance |
< td> | -0.5,+0.6 |
<4 | -12.5%, +15% |
How to test JIS G3441 Alloy Steel Tubes:
- Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation)
- Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test etc)
- Exterior Size Inspection.
- Mill Test Certificate:EN 10204/3.1B
- Delivery Condition:BKS, NBK,BK ,BKW, GBK(+A), NBK(+N), BK(+C)
JIS G3441 Alloy Steel Tubes Chemical composition Limits(%)
Steel grade | Steel grade(old) | C | Si | Mn | P | S | Cr | Mo |
SCr420TK | – | 0.18~0.23 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM415TK | – | 0.13~0.18 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM418TK | – | 0.16~0.21 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM420TK | – | 0.18~0.23 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM430TK | As STKS1 | 0.33~0.38 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM435TK | As STKS3 | 0.33~0.38 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
SCM440TK | – | 0.38~0.43 | 0.15~0.35 | 0.60~0.85 | <0 td> | <0 td> | 0.90~1.20 | 0.15~0.30 |
Packing:
- Plastic plugs in both ends, Hexagonal bundles of max. 2,000kg with several steel strips
- Two tags on each bundle
- Wrapped in waterproof paper
- PVC sleeve, and sackcloth with several steel strips