Steel 12K

Designation

12K steel is used: for the manufacture of parts of boilers and sosudov working under pressure at ambient, elevated and reduced temperatures.

From 01.01.1991 steel stamps 12K is not allowed to use in the newly created and upgraded technology.

Name	Code	Standards
Sheets and strips	В23	GOST 19903-74, GOST 19903-90, GOST 5520-69

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	KCU, kJ/m²
Leaves categories: 2-5, 10, 11, 16, 18 (KCU - as supplied / after mechanical aging)
≤20	≥225	350-440	≥24	≥780/390
41-60	≥205	350-440	≥24	≥780/390

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
KCU	Toughness

Name	The value
Weldability	Welded without any restrictions.