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US 6,206,984 B1Granted
Non-heat treated wire or bar steel for springs
AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsAtsushi Inada, Nao Yoshihara, Nobuhiko Ibaraki
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Abstract
A non-heat treated wire or bar steel for springs which is characterized by having in its as-rolled state a tensile strength of 120-150 kgf/mm2 and a bending breakage rate no higher than 15% when tested according to JIS Z-2248 under the condition of r/d=2.8 where r (mm) denotes the inside radius of the bending curvature and d (mm) denotes the diameter of the as-rolled stock.
Claims12
A non-heat treated wire or bar steel comprising
- Nb:
- 0.005-0.15 wt %,
- Ti:
- 0.01-0.1 wt %,
- B:
- 0.0005-0.01 wt %,
- Cr:
- 1.02-1.8 wt %, and
- a remainder of Fe and unavoidable impurities, wherein
- the steel has in its as-rolled state a tensile strength of 120-150 kgf/mm2 and a bending breakage rate no higher than 15% when tested according to JIS Z-2248 under a condition of r/d=2.8 where r(mm) denotes an inside radius of a bending curvature and d(mm) denotes a diameter of the steel in the as-rolled state.
7 more elements
A steel spring consisting of
- C:
- 0.13-0.35 wt %.
- Si:
- 0.1-1.8 wt %.
- Cr:
- 1.02-1.8wt %.
- Mn:
- 0.8-2.5 wt %.
- Al:
- more than 0—less than or equal to 0.08 wt %.
- Nb:
- 0.005-0.15 wt %,
- Ti:
- 0.01-0.1 wt %,
- B:
- 0.0005-0.01 wt %,
- V:
- up to 0.2 wt % (including 0 wt %),
- S:
- up to 0.018 wt % (including 0 wt %,
- Nb+Ti:
- no less than 0.08 wt %, and
- a remainder of Fe and unavoidable impurities.
20 more elements
Dependencies are inferred from the claim text.