Deformable light alloy steel with TRIP) and TWIP properties useful in production of products having decreased crack liability twinning induced plasticity (TWIP) good ductility and tensile strength without increase in hydrogen embrittlement

摘要

Deformable light alloy steel with transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) properties of composition (wt.%):C (0.05 to =1.0), Al 0.0 to =11.0), Si (0.0 to =6.0), Al+Si greater than 0.05, Mn (9.0 to =25.0, H less than 20 ppm, remainder Fe and usual steel impurities, where alloying composition is present in various phases. Alloy can have decreased Mn content and increased C content or increased content and decreased C content. The C/Mn pair value (sic) lies in C/Mn coordinate system approximating to linear bond line (sic), which is distance from the C/Mn pair value in equilibrium between gamma-austenite and alpha'- martensite phases.