Hot Rolled Forging Tools 180mm 42CrMo4 Alloy Flat Bar

SCM440/SAE4140/1.7225 steel flat bar for mechanical with width 2000-2200mm

SCM440 SAE4140 1.7225 42CrMo4 air hardening tool steel alloy Flat Bar

EN 1.7225---4140 is a high alloy austenitic stainless steel. The grade is intended for use under severe corrosive conditions. The steel grade was originally developed to resist corrosion in dilute sulphuric acid. EN 1.7225 is fully austenitic, and is less sensitive to precipitation of ferrite and sigma phase than conventional austenitic grades with high molybdenum content. Due to the combination of relatively high contents of chromium, nickel, molybdenum and copper, EN 1.7225 has good resistance to general corrosion, particulary in dilute sulphuric acid. It is non-magnetic in the annealed condition but may become slightly magnetic as a result of cold-working or welding.

Chemical composition(%):

Equivalent grades:

Available size(mm):

Appliation:
Production load large, complex shape and valuable tool (e.g, scraper, gear, milling cutter, drilling, tapping, etc.)Cold forging die, forging tools;Strip cutting machine, heading forming die.

Hardness:

Anneal≤217HB

Q+T 28-32HRC

Heat Treatment

1) Forging

Preheat the steel carefully, then raise the temperature to 1150-1200°C for forging. Do not forge below 850°C.

2) Annealing

Heat the AISI 4140 slowly to 800-850°C and allow enough time for the steel to be thoroughly heated. Cool slowly in the furnace to 480°C followed by air cooling.

3) Stress Relieving

When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening.

4) Hardening

AISI 4140 steel is usually supplied ready heat treated to 18-22HRC. If further heat treatment is required annealed AISI 4140 should be heated slowly to 840-875°C and after adequate soaking at this temperature quench in oil. Temper as soon as the tools reach room temperature.

5) Tempering

Heat the AISI 4140 carefully to a suitable temperature selected by reference to a tempering chart or table (usually between 550-700°C, soak at the temperature for 2 hours per 25mm of ruling section, then allow to cool in air. Tempering between 250-375°C is not advised as tempering within this range will seriously reduce the impact value.

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