5160 Spring Steel Bar Round Flat ASTM 1566 A29M 04
ASTM1566 Spring Steel Round Bar ASTM A29 / A29M-04 bright round bar
Manganese in ASTM1566 improves hardenability, φ 12mm steel can be quenched in oil, and its surface decarburization tendency is smaller than that of silicon steel. The comprehensive mechanical properties after heat treatment are better than that of carbon steel, but it has overheating sensitivity and temper brittleness. ASTM1566 is used for various flat and round springs, seat cushion springs, spring springs of small sizes, and also for making spring rings, valve springs, clutch springs, brake springs and cold-drawn steel wire cold-rolled coil springs.
Supply Form & Size
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | 6.0mm-1200mm | 2.5m-10m |
Chemical Composition&Related Specifications
| Grade | C | Si | Mn | S | P | Cr | Ni | Cu |
| 1566 | 0.60-0.71 | 0.17-0.37 | 0.85-1.15 | ≤0.050 | ≤0.040 | ≤0.25 | ≤0.25 | ≤0.25 |
Brand comparison table
| AISI/SAE | DIN/EN | BS | JIS/KS | China |
| 1566 | / | / | SWRH67B | 65Mn |
Mechanical Property
|
tensile strength σb (MPa) |
≥980(100) |
|
yield strength σs (MPa |
≥784(80) |
| elongation δ5 (%) | ≥8 |
| reduction of area ψ (%) | ≥30 |
|
Heat treatment specification |
quench830℃±20℃,
Oil cooling; tempering540℃±50℃(In case of special needs,±30℃). |
|
hardness |
hot roll,≤302HB;Cold drawing+heat treatment,≤321HB |
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