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AISI 4130 Alloy Steel
AISI 4130 is a low alloy steel containing molybdenum and chromium as strengthening agents. The carbon content is nominally 0.30% and with this relatively low carbon content, the alloy is excellent from the fusion weldability standpoint. The alloy can be hardened by heat treatment. With a lower carbon content range, AISI 4130 provides better weldability than that of other oil and gas steel grades such as AISI 4140.
Applications
Analysis
Forging
Annealing
Stress Relieving
Hardening
Tampering
Applications
Typical applications for 4130 low alloy steel include. structural use such as aircraft engine mounts and welded tubing applications.
Analysis
| Carbon | 0.28-0.33% | Chromium | 0.90-1.10% |
| Manganese | 0.40-0.60% | Molybdenum | 0.15-0.25% |
| Silicon | 0.10-0.35% | Phosphorous | 0.035% max |
| Nickel | 0.25% max | Sulphur | 0.040% max |
Forging
Preheat carefully, then raise temperature to 950-1200°C for forging. Do not forge below 950°C.
Annealing
Heat the AISI 4130 slowly to 850°C and allow enough time for the steel to be thoroughly heated. Cool slowly in the furnace to 480°C followed by air cooling.
Stress Relieving
When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to any hardening.
Hardening
AISI 4130 steel is usually supplied ready heat treated with a hardness of 18-22HRC. If further heat treatment is required annealed AISI 4130 should be heated slowly to 870-890°C and after adequate soaking at this temperature quench in oil. Temper as soon as tools reach room temperature.
Tampering
Heat carefully to a suitable temperature selected by reference to a tempering chart or table (usually between 400-570°C, soak at the temperature for 2 hours per 25mm of ruling section, then all to cool in the air. Tempering between 250-375°C is not advised as tempering within this range will seriously reduce the impact value.
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