| 摘要 |
Austenitic lightweight steel with a characteristic value of the cold formability higher than 30,000 MPa %, with tensile strengths between 600 and 800 MPa, and fracture strains over 50% has a chromium content of >2.0%<18%, a silicon content of >1.0%<4%, a manganese content of >2.0%<20%, an aluminum content of >0.05%<4%, wherein the steel is within an alloying range determined by <?in-line-formulae description="In-line Formulae" end="lead"?>(Cr<SUB>equ</SUB>=14; Ni<SUB>equ</SUB>=14.5);<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>(Cr<SUB>equ</SUB>=14; Ni<SUB>equ</SUB>=17.5)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>(Cr<SUB>equ</SUB>=20; Ni<SUB>equ</SUB>=10)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>(Cr<SUB>equ</SUB>=20; Ni<SUB>equ</SUB>=13),<?in-line-formulae description="In-line Formulae" end="tail"?> wherein the chromium and nickel equivalents are calculated based on the following relations (1) and (2): <?in-line-formulae description="In-line Formulae" end="lead"?>Cr<SUB>equ</SUB>=% Cr+% Mo+1.5% Si+0.5% W+0.9% Nb+4% Al+4% Ti+1.5% V (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>Ni<SUB>equ</SUB>=% Ni+30% C+18% N+0.5% Mn+0.3% Co+0.2% Cu-0.2% Al (2)<?in-line-formulae description="In-line Formulae" end="tail"?> from the chemical composition of the steel, wherein the values represent wt. % and the balance is largely iron and other steel accompanying elements.
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