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Product Details:
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| Thickness: | 0.1 To 6 Mm | Width: | 10 To 400 Mm |
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| Delivery Condition 1: | Cold Rolled + Hardened + Tempered | Delivery Condition 2: | Cold Rolled + Soft Annealed : G |
| Steel Number: | 1.5029 | Steel Grade: | 71Si7 |
| Surface Condition: | Bright, Grey-blue, Polished, Polished And Colour-tempered | Form: | Steel Coils Strips |
| Standard: | DIN 17222 | ||
| High Light: | 1.5029 Cold Rolled Steel Strips,71Si7 Cold Rolled Spring Steel Strip,Springs Cold Rolled Steel Strips |
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Cold rolled steel strip for springs is distinguished by high dimensional accuracy and good surface quality and, in the cold rolled + hardened + tempered condition (H + A) offers the possibility of achieving high values of hardness, tensile strength and elastic limit.
71Si7 1.5029 steel is an unalloyed medium carbon engineering steel which has 0.68%-0.75% Carbon and 1.5%-1.8% Silicon. It will obtain high hardness and high strength after hardening due to the relatively high carbon content.
Thickness: 0.1 to 4mm; Tolerances: +/- 0.008 to 0.11 mm
Width: 10 to 600mm; Tolerances: +/- 0.15 to 0.60mm
| Steel number | grade number | C | Si | Mn | P | S |
| 71Si7 | 1.5029 | 0,68 to 0,75 | 1,50 to 1,80 | 0,60 to 0,80 | 0,035 | 0,035 |
Cold rolled + soft annealed : G
Cold rolled + hardened + tempered : H + A
| Steel number | grade number | Tensile strength N/mm2 maximum | Elongation at break (L = 80 mm) % minimum | Vickers hardness maximum |
| 71Si7 | 1.5029 | 800 | 9 | 240 |
| Steel number | grade number | Tensile strength N/mm2 |
| 71Si7 | 1.5029 | 1500 to 2200 |
| Steel number | grade number | Vickers hardness |
| 71Si7 | 1.5029 | 445 to 650 |
Strip to be supplied in the
1 cold rolled + soft annealed G or
2 cold rolled + soft annealed + cold rolled (G + K) condition
must have a bright, metallically clean surface.
Cold rolled + hardened + tempered (H + A) strip is supplied, as agreed at the time of ordering, with
1 grey-blue (GR),
2 bright (8K),
3 polished (P) or
4 polished and colour-tempered (P & AF) surface.
Approximate values for heat treatment and minimum hardness values in the hardened condition of cold rolled steel strips for springs
| Steel number | grade number | Annealed °C | Hardened in oil at °C | Tempered to °C | Vickers hardness in hardened condition minimum |
| 71Si7 | 1.5029 | 650 to 690 | 810 to 840 | 300 to 500 | 680 |
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
Contact Person: Ms. Florence Tang
Fax: 86-731-89853933
