S35C S45C Carbon Steel Seamless Tubes for machining or structural use (hereafter referred to as steel tubes) are manufactured by cold rolled or cold drawn. This material applies to steel products with a uniform cross-section, generally supplied for use after a further process such as cold working, cutting, and heat treatment.
S35C S45C Carbon Steel Seamless Tubes are widely used in mechanical equipment manufacturing, automotive parts manufacturing, and other finishing industries.
Reference standard for S35C S45C material: JIS G4051
The reference standard for S35C and S45C steel tube pipe production is JIS G3445, DIN2391, EN10305, GB/T3639.
Grades | C | Si | Mn | P | S | Ni | Cr | Cu | Ni+Cr |
S35C | 0.32 to 0.38 | 0.15 to 0.35 | 0.6 to0.9 | 0.03max | 0.035max | 0.20 max | 0.20max | 0.30max | 0.35max |
S45C | 0.42 to 0.48 | 0.15 to 0,35 | 0.6 to0.9 | 0.03max | 0.035max | 0.20 max | 0.20max | 0.30max | 0.35max |
| Cold finished Condition | |||
| Steel Grade | Tensile | Yield | Elongation |
| Strength Rm (MPa) | Strength ReL (Mpa) | A (%) | |
| S35C | 550min | 480min | ≥10 |
| S45C | 600min | 520min | ≥10 |
| Description | Tolerances on outside diameter and inside diameter |
| Cold-drawn or cold-rolled tubes | Under 25mm ±0.12mm |
| 25mm or over to and excl. 40mm ±0.15mm | |
| 40mm or over to and excl. 50mm ±0.18mm | |
| 50mm or over to and excl. 60mm ±0.20mm | |
| 60mm or over to and excl. 70mm ±0.23mm | |
| 70mm or over to and excl. 80mm ±0.25mm | |
| 80mm or over to and excl. 90mm ±0.30mm | |
| 90mm or over to and excl.100mm ±0.40mm | |
| 100mm or over ±0.50% |
Thickness tolerance:
| Description | Tolerances on wall thickness |
| Cold-drawn or cold-rolled tubes | Under 3mm |
| ±0.3mm | |
| 3mm or over | |
| ±10% |
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