Steel 40ХН2СМА (EI643M)

Designation

Name The value
Designation GOST Cyrillic 40ХН2СМА
Designation GOST Latin 40XH2CMA
Transliteration 40HN2SMA
By chemical elements 40CrН2СMo
Name The value
Designation GOST Cyrillic ЭИ643М
Designation GOST Latin EI643M
Transliteration EhI643M
By chemical elements -

Description

40ХН2СМА steel is used: for the manufacture of seamless tubes and components for chemical engineering and special equipment.

Note

High-strength steel. The replacement of molybdenum vanadium steel marked 40ХН2СВА (ЭИ643).

Standards

Name Code Standards
Classification, nomenclature and General rules В20 OST 1 90005-91
Norms for calculation and design В02 PI 1.2.053-78
Blanks. Of the workpiece. Slabs В31 TU 1-92-156-90
Bars and shapes В32 TU 14-1-1885-85, TU 14-1-313-72
Steel pipes and fittings to them В62 TU 14-3-170-73, TU 14-3-674-78, TU 14-3-463-2005

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Mo W
TU 14-1-1885-85 0.36-0.42 ≤0.011 ≤0.015 0.5-0.8 0.8-1.1 0.7-1 2.5-3 Rest ≤0.25 0.3-0.4 -
TU 14-1-313-72 0.36-0.42 ≤0.025 ≤0.025 0.5-0.8 0.8-1.1 0.7-1 2.5-3 Rest - 0.3-0.4 ≤0.2
TU 14-3-674-78 0.36-0.44 ≤0.005 ≤0.025 0.25-0.5 0.8-1.1 0.9-1.2 1.8-2.1 Rest - 0.35-0.45 -
Fe is the basis.
According to TU 14-3-674-78 the chemical composition is given for steel 40ХН2СМА-ВД (ЭИ643М-ВД).
According to TU 14-1-313-72 the chemical composition is given for steel 40ХН2СМА (ЭИ643М). The mass fraction of residual copper in steel should not exceed 0.25%. In bars and forgings, subject to other requirements, deviations from the chemical composition standards for carbon are allowed - + 0.010%, for manganese - ± 0.050%, for chromium ± 0.10%, for nickel ± 0.10%, for tungsten - ± 0.10%, molybdenum - + 0.050%.
According to TU 14-1-1885-85 the chemical composition is given for steel 40ХН2СМА-ВД (ЭИ643М-ВД). To ensure the required grain size, it is allowed to introduce vanadium in the steel smelting at the rate of its content in steel no more than 0.10%, the content of which in steel is not determined. The presence of tungsten to 0.20%, titanium to 0.030% is not a rejection sign. In the steel, partial replacement of molybdenum with tungsten is allowed. The total content of molybdenum and tungsten converted to molybdenum from the calculation: three parts by weight of tungsten replace one part by weight of molybdenum, should correspond to the content of molybdenum indicated in the table. In this case, the content of tungsten in steel should not exceed 0.30%. The permissible deviation in the content of manganese in steel is + 0.010 / -0.020%, in carbon content + 0.010%, in sulfur and phosphorus content, provided that their total content is not more than 0.022%.

Mechanical properties

Section, mm σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- 1770-1960 - - - - 49.5-52.5
Bars of steel 40ХН2СМА (EI643M) TU 14-1-1885-85. Quenching in oil with 890-910 °C + Vacation at 200-260 °C, air cooling. In the graph KCU KCU values are shown along the fiber/KCU across the grain
≥1860 ≥9 ≥40 ≥490/106 ≤514 -
Long products and forgings on the other 1-92-156-90 (TU 14-1-313-72). Quenching in oil with 890-910 °C + Vacation at 200-260 (200-300) °C, air cooling
≥1860 ≥8 ≥35 ≥590 ≤514 -

Description mechanical marks

Name Description
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number
HRC Rockwell hardness (indenter diamond spheroconical)

Technological properties

Name The value
Macrostructure and pollution Macrostructure of steel when testing for the breaks in the longitudinal direction and transverse templeto selected from rolled, should not have shrinkage, porosity, bubbles, cracks, delamination, inclusions and placenow and defects of fracture, listed in Annex 3 GOST 10243. The Central porosity, point heterogeneity and phase separation in the square should not exceed 1 points; layer-by-layer crystallization and the bright loop - 3 points reference scales GOST 10243. All other defects under GOST 10243, are not allowed. Pollution steel non-metallic inclusions should be according to the average score is not higher (in points): oxides of point 1,5, 2,0 stroke oxides, silicates fragile 1,0, 1,0 silicates plastic, silicates, non-deformed 2,5, 2,5 sulfides, nitrides stroke and point 1,0.
Features of heat treatment Bars and forgings on the other 14-1-313-72 put after the heat treatment (low annealing), hardness Brinell hardness no more than 269НВ (indentation diameter not less than 3.7 mm). Recommended low mode annealing: heating to a temperature of 650-680 °C, exposure time 12 hours, air cooling. Forgings to low annealing subjected to preliminary normalization with a temperature of 900 °C.