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Steel 12K

Description

Steel 12K

Steel 12K: brand of steels and alloys. Below is a systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the grade — Steel 12K.

General information of steel 12K

Delivery type
Thick sheet GOST 5520−79, GOST 19903−74.
Application
For the manufacture of parts, parts of boilers and vessels operating under pressure at room, high and low temperatures.

Chemical composition of steel 12K

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.40−0.70
Copper (Cu), no more 0.30
Arsenic (As), no more 0.08
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.04
Carbon (C) 0.08−0.16
Phosphorus (P), no more 0.04
Chromium (Cr), no more 0.30

Mechanical properties of 12K steel

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% KCU, J / m 2
KCU — + 20 ° С / after mechanical aging
Category sheets: 2−5, 10, 11, 16, 18 <20 225 350−440 24 78/39
Category sheets: 2−5, 10, 11, 16, 18 21−40 215 350−440 24 78/39
Category sheets: 2−5, 10, 11, 16, 18 41−60 205 350−440 24 78/39

Mechanical properties when tested for long-term strength

Creep limit, MPa Creep rate,% / h t test, ° С Long-term strength, MPa Duration tests, h t test, h
162 1/10000 400 115 10000 450
64 1/10000 480 69 100,000 450
108 1/100000 400 68 200,000 450
31 1/100000 480 33 200,000 480

Technological properties of steel 12K

Weldability
Can be welded without restrictions.

Yield strength of steel 12K

Test temperature, ° C / s 0.2
200 250 300 350 400 450
180 170 140 120 98 78

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