ULTRA-HIGH STRENGTH MARAGING STAINLESS STEEL WITH SALT-WATER CORROSION RESISTANCE

摘要

An ultra-high strength maraging stainless steel with nominal composition (in mass) of C ≤ 0.03%, Cr: 13.0-14.0%, Ni: 5.5-7.0%, Co: 5.5-7.5%, Mo: 3.0-5.0%, Ti: 1.9-2.5%, Si: ≤ 0.1%, Mn: ≤ 0.1%, P: ≤ 0.01%, S: ≤ 0.01%, and Fe: balance. The developed ultra-high strength maraging stainless steel combines ultra-high strength (with σb ≥ 2000MPa, σ0.2≥1700MPa, δ ≥ 8% and ψ ≥ 40%), high toughness (KIC ≥ 83 MPa⋅m1/2) and superior salt water corrosion resistance (with pitting potential Epit ≥ 0.15 (vs SCE)). Therefore, this steel is suitable to make structural parts that are used in harsh corrosive environments like marine environment containing chloride ions, etc.