Steel 12H18N12M3TL

Designation

Name The value
Designation GOST Cyrillic 12Х18Н12М3ТЛ
Designation GOST Latin 12X18H12M3TL
Transliteration 12H18N12M3TL
By chemical elements 12Cr18Н12Mo3Ti

Description

Steel 12H18N12M3TL used: for the manufacture of castings parts, resistant to boiling sulfurous, phosphoric, formic, acetic and other acids; components with long time working under load at temperatures up to +800 °C; casting groups 1, 2, 3 parts of valves and actuators to it, working in the sulfuric boiling phosphoric acid and the sulfide liquor and at high temperature working conditions from -196 to +600 °C without restriction of the nominal working pressure; casting parts shipbuilding with protectron protection requirements increased resistance against pitting corrosion in sea water; casting parts mining and metallurgical equipment; casting equipment parts (valves) for nuclear power stations, heat supply stations, heat and power plants, experimental and research nuclear reactors and installations.

Note

Romancelatina casting corrosion-resistant, acid-resistant, heat-resistant austenitic steel.
Steel is not susceptible to intergranular corrosion at temperatures up to +800°C.

Standards

Name Code Standards
Castings with special properties (iron and steel) В83 GOST 2176-77, KSt 81-033:2009, TU 14-1-1241-75, TU 4112-78269737-009-05
Steel castings В82 GOST 977-88, OST 26-07-402-83, OST 5Р.9285-95, TU 108-23.46-88, TU 4112-091-00220302-2006, ST ЦКБА 014-2004, TU 5.961-11151-92
Thermal and thermochemical treatment of metals В04 STP 26.260.484-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Mo
TU 5.961-11151-92 ≤0.12 ≤0.03 ≤0.035 1-2 16-19 0.2-1 11-13 Rest - 3-4
GOST 2176-77 ≤0.12 ≤0.03 ≤0.035 1-2 16-19 0.2-1 11-13 Rest ≤0.3 3-4
Fe is the basis.
According to GOST 977-88, OST 5P.9285-95 and TU 5.961-11151-92, the content of Ti = 5 · C% is 0.70%.
According to OST 5R.9285-95, the copper content up to 0.40% and molybdenum up to 0.12% is not a defect sign provided that the requirements of the standard are observed and if there are no special instructions in the technical conditions of the order or drawing.
According to TU 5.961-11151-92 for castings of grades 1 and 2 the mass fraction of cobalt in steel should not exceed 0.20%, and for castings in the direct irradiation zone - 0.15%.
According to GOST 2176-77 the chemical composition is given for steel grade 12H18N12M3TL. The content of Ti = 5 · C% is 0.80%. Deviations from the norms of chemical composition are allowed: for carbon ± 0.020%; for silicon ± 0.10%; on manganese, copper, chromium and nickel ± 0.10% each; by titanium and tungsten ± 0.050% each; by vanadium, molybdenum and niobium ± 0.020% each.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % d y, % KCU, kJ/m2 HB, MPa
The castings are supplied according to GOST 2176-77
- ≥216 ≥441 ≥25 - ≥30 ≥588 -
Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Quenching in water from 1100-1150 °C
- ≥220 ≥500 - ≥30 - ≥588 -
Castings for shipbuilding. Quenching in water from 1100-1150 °C, cooling in water
100 ≥220 ≥500 ≥35 - ≥30 - 129-183
Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Quenching in water from 1100-1150 °C
- ≥170 ≥450 - ≥27 - - -
Casting for STP 26.260.484-2004. Quenching in water, oil or air from 1100-1150 °C
≥220 ≥450 ≥25 - ≥30 - -
Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Quenching in water from 1100-1150 °C
- ≥160 ≥400 - ≥23 - - -
- ≥150 ≥360 - ≥19 - - -
- ≥140 ≥340 - ≥16 - - -

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
d Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number

Technological properties

Name The value
Weldability Good weldability. Welding methods: RDS and ADS under gas protection. Recommended heating and subsequent heat treatment.
Features of heat treatment Products hromonikelevoj steel stabilized with titanium, to remove residual stresses and prevent stress corrosion cracking may be subjected to heat treatment according to the requirement stipulated in the draft mode which should be agreed with specialized organization. Steel products are subjected to hardening in order to improve the overall corrosion resistance and ductility, to eliminate the tendency to intergranular corrosion. Casting of steel 12H18N12M3TL should be quenched from 1100-1150 °C, cooling in water, oil or air. The holding time at the heating for hardening to products with a wall thickness up to 10 mm - 30 min, over 10 mm - 20 min + 1 min per 1 mm maximum thickness.