S355 ning odatiy tarkibi (avtomobil sinfi)?
C 0,22% dan kam yoki teng, Si 0,55% dan kam yoki teng, Mn 1,60% dan kam yoki teng, P 0,025% dan kam yoki teng, S 0,015% dan kam yoki teng.
Mexanik xususiyatlar (asosiy avtomobil ko'rsatkichlari)?
Oqim kuchi: 355MPa (16 mm dan kam yoki unga teng)
Kuchlanish kuchi: 470–630MPa
Cho'zilish: 21% dan katta yoki teng (JR); 25% dan katta yoki unga teng (MC)
Ta'sir: JR (20 gradusda 27J dan katta yoki teng), J2 (-20 darajada 27J dan katta yoki teng), MC (sovuq shakllanish uchun ajoyib)
Qattiqlik (HB)?
140–190HB, kesish / burg'ulash / shtamplash oson.
Charchoq ishlashi (asosiy avtomobil jihati)?
Yuqori{0}}sikl charchoq ≈180–220MPa, Q235 dan taxminan 40% yaxshiroq, shassi/osma oʻzgaruvchan yuklarga mos keladi.
Weldability (key automotive aspect)? Carbon equivalent ≤0.40%, no preheating required for conventional welding; for thick plates (>20 mm), yorilishning oldini olish uchun 100-150 daraja oldindan qizdirish kerak.