EI72 (30H13N7S2)

Country	Section	Category
CIS, Russia, Ukraine	Corrosion-resistant alloys and steels	Corrosion-resistant alloys

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %	W, %
GOST 5632-14	73.285–79.75	2–3	< 0.8	12–14	< 0.2	6–7.5	< 0.2	< 0.025	0.25–0.34	< 0.25	< 0.2	< 0.2

Property
Performance characteristics Scale formation temperature: 950 ° C
According to GOST 5949 Note. The norms of mechanical properties apply to samples taken from steel with a diameter or thickness of up to 60 mm.
According to GOST 5949 Note. The norms of mechanical properties apply to samples taken from steel with a diameter or thickness of up to 60 mm.
relative narrowing by 5abs.% and impact strength by 4.9 J / cm2 at a rate of less than 78.4 J / cm2 and by 9.8 J / cm2 at a rate of 78.4 J / cm2 or more.
For steel with a diameter or thickness of st. 100 to 150mm, a reduction in elongation of 3abs.% Is allowed,
a relative narrowing of 10 abs.% and impact strength of 9.8 J / cm2 at a rate of less than 78.4 J / cm2 and at 14.7 J / cm2 at a rate of 78.4 J / cm2 or more.
Quenching 1040-1060 ° С in air Annealing 860 - 880 ° С, cooling to 700 ° С 2 hours in air, then in an oven
Annealing 660 - 680 ° С, 30 minutes, air cooling Quenching 790-810 ° С in oil
GOST 5949 Yield strength:> 785 MPa Tensile strength:> 1180 MPa Elongation:> 8% Impact strength KCU at 20 ° C:> 20 J / cm2 Relative narrowing:> 25%
By agreement M1 (tests at elevated temperature) Note By agreement
Calculated Properties Density: 7.7 g / cm3
Note Heat-resistant steel Martensitic steel Stable in sulfur-containing environments