Brief introduction of the most popular cold formed

A brief introduction to Japanese cold formed spring steel wire

I Cold formed spring steel wire classification

spring steel wire

1) cold drawn steel wire: jisg3522 piano steel wire (swp-a, swp-b, swp-c,)

jisg3521 high carbon steel wire (SWA, SWB, SWC,)

jisg4314 stainless steel wire for spring (SUS302 WPA, WPB, SUS304 WPA, WPB, SUS316 WPA, su3631j1-wp1, force discrimination rate: 0.001-0.1n (determined by range) ）C)

2) heat treated steel wire: jisg3560 carbon oil quenched steel wire for spring swd-a, swd-b

jisg3561 carbon oil quenched steel wire for valve spring swd-v

jisg3565 vanadium oil quenched steel wire for valve spring swdcv-v

jisg3566 silicon oil quenched steel wire for valve spring swdsc-v

jisg356 as the top event in the Western plastic industry 7 silicon manganese oil quenched steel wire for spring swdsm-a, swdsm-b, swdsm-c

With the gradual entry of automobiles into people's daily life, spring silicon Ming quenched steel wire swdsc

II. Piano steel wire and high carbon steel wire

Piano steel wire is a high-quality spring material produced by wires with low impurity elements (P, s, Cu) and surface defects such as hair line decarburization, which is usually used to produce precision springs. Compared with piano steel wire, high carbon steel wire does not require strict fatigue strength and spring characteristics, but it is not far from piano steel wire

III. oil quenched steel wire

the spring steel wires used in the production of automotive valves include swp-v, swo-v, swocv and swosc-v. In recent years, with the high speed of engine revolution and the high temperature of high service temperature, higher requirements are put forward for the fatigue resistance and fire resistance of quenched steel wire. The suspension spring is developing in the direction of high stress and lightweight. At present, the traditional materials 50cwa, sup12, SUP7 and sae9259 are unable to cope with the stress above 1100mpa, and tend to be eliminated, while their substitutes sae9254tv, SRS60, uhs1900 and UHS2000 tend to be widely used

IV. stainless steel wire for spring

spring production also has strict requirements for stainless steel wire. In addition to being stainless and corrosion-resistant, stainless steel wire is now required to have higher tensile strength, and its fatigue life should be compared with piano steel wire in all steel trade ecosystems. Precipitation hardening stainless spring wire has a broader prospect. With the development of wire drawing auxiliary materials, all these are gradually realized

v. surface treated steel wire

1) all kinds of coated steel wire: generally, the re coating of the spring after forming will affect the performance of the spring, and the steel wire produced by plating before drawing can reduce this situation to a certain extent

2) existing coating types: zinc plating, nickel plating, tin plating, copper plating, or mixed plating, etc

VI. other spring steel wires

maraging steel wires

in the engine valve spring, when the engine revolution exceeds 10000 times/hour under high stress, the material is required to have high heat resistance. However, when the oil quenched steel wire can not meet such requirements, the maraging steel wire can be used. After low temperature nitriding treatment, it is very effective to improve the characteristics of valve spring. (end)