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| Surface: | Indented |
| Application: | Packaging |
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astm a228 steel
astm a228 Spring wire
ASTMA 228 Spring Steel
Name of material: spring steel
Grade: astm a228 Steel
Standard: GB/T 1222-2007
astm a228 Steel characteristics and application Scope:
After heat treatment and cold drawing hardening, high strength, toughness and plasticity; The fatigue limit is similar to that of alloy springs at the same surface state and full quenching. But the hardenability is poor, mainly used for smaller size of the spring, such as pressure regulating spring, force spring, general mechanical round, square coil spring or pulled into steel wire for small mechanical spring.
Chemical composition editor
astm a228 Tempering Components:
C: 0.62 ~ 0.70
Si: 0.17 ~ 0.37
Manganese Mn: 0.90 ~ 1.20
Sulfur S: ≤0.035
P: ≤0.035
Chromium Cr: ≤0.25
Nickel Ni: ≤0.25
Copper Cu: ≤0.25
Editing for Mechanical Properties of astm a228 Steel
Tensile strength Rb(MPa) : 735
Yield strength Rs (MPa) : 430
Elongation δ10 (%) : 14~21.5
Reduction of cross-section (%) : not less than 10
GB_T699-1999(high quality carbon structural steel)
Hardness editing
Hardness of Hot rolled astm a228 Steel: 240~270HB
Cold rolled astm a228 steel soft hardness: 190~220HB
Cold Rolled Hardness of astm a228 Steel: 300~340HB
astm a228 Steel Hardness of Heat Treatment: 38~60HRC
Editing of astm a228 Heat Treatment of steel
astm a228 Heat Treatment and Specification for Steel
Quenching 830ºC±20ºC, oil cold; Temper 540ºC±50ºC(for special needs,±30ºC).
Critical point temperature (approximate) Ac1=726ºC, Ac3=765ºC, Ar3=741ºC, Ar1=689ºC, Ms=270ºC.
Normalizing specification: Temperature 810±10ºC, air cooling.
Quenching and tempering specification: quenching temperature 830±10ºC, oil cooling; Tempering temperature 540ºC±10ºC, water, oil cooling.
astm a228 steel delivery status
Hot-rolled steels are delivered in heat-treated or non-heat-treated condition and cold-drawn steels are delivered in heat-treated condition. (2.0-16) *1250*C Laisteel/Hot coil/hot plate
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