Production process for producing hollow steel tube of high stren

Details Production process for producing hollow steel tube of high stren Production process for producing hollow steel tube of high stren

1993-10-18

1995-04-11

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

With measuring, testing, or sensing

148519, 148590, C21D 908

Patent

active

054054591

ABSTRACT:
A production process for producing a hollow steel tube of a high strength includes the steps of a tube preparation step of producing a seamless steel tube of a heavy thickness containing flaws of less than 0.25 mm in depth in an inner periphery thereof, a tube inner periphery correction step of correcting at least the flaws having a width of 0.001 mm or less so as to have a depth of 0.15 mm or less, and a hardening step of hardening the seamless steel tube across a whole thickness thereof to a hardness of from 450 to 670 in Vickers hardness (Hv). The production process enables not only to produce a hollow steel tube of a high strength at a less production cost but also to adapt it to exhibit such a high torsional fatigue fracture resistance and a high impact strength that it is applicable to axles for large size automobiles producing high outputs.

REFERENCES:
patent: 4370178 (1983-01-01), Waid et al.

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