Spring steel with improved hardenability and pitting resistance

Details Spring steel with improved hardenability and pitting resistance Spring steel with improved hardenability and pitting resistance

2003-11-13

2010-12-14

Ip, Sikyin (Department: 1793)

Metal treatment

Stock

Ferrous

C148S335000, C420S091000, C420S092000, C420S093000

Reexamination Certificate

active

07850794

ABSTRACT:
The present invention provides a spring steel that has superior hardenability, undergoes less pitting in a corrosive environment, and can achieve higher stress and toughness. More specifically, the present invention provides a high-strength and high-toughness spring steel with improved hardenability and pitting resistance, containing, in mass percent, 0.40 to 0.70% carbon, 0.05 to 0.50% silicon, 0.60 to 1.00% manganese, 1.00 to 2.00% chromium, 0.010 to 0.050% niobium, 0.005 to 0.050% aluminum, 0.0045 to 0.0100% nitrogen, 0.005 to 0.050% titanium, 0.0005 to 0.0060% boron, no more than 0.015% phosphorus and no more than 0.010% sulfur, the remainder being composed of iron and unavoidable impurities, the steel having a tensile strength of at least 1700 MPa in 400° C. tempering after quenching and a Charpy impact value of at least 40 J/cm2for a 2 mm U-notched test piece of JIS 2202 and the parameter Fce being at least 1.70.

REFERENCES:
patent: 5186768 (1993-02-01), Nomoto et al.
patent: 6322747 (2001-11-01), Fukuzumi et al.
patent: 2 164 579 (1996-06-01), None
patent: 0 461 652 (1991-06-01), None
patent: 0 943 697 (1998-05-01), None
patent: 2-149645 (1990-06-01), None
patent: 10-025537 (1998-01-01), None
patent: 11-152519 (1999-06-01), None
patent: 11152519 (1999-06-01), None
patent: 2001-234277 (2001-08-01), None

Affiliated with

Also associated with

Rating

Spring steel with improved hardenability and pitting resistance does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Spring steel with improved hardenability and pitting resistance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spring steel with improved hardenability and pitting resistance will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4215396