Steel 20KH17N2 (2Х17Н2)

Designation

Name The value
Designation GOST Cyrillic 20Х17Н2
Designation GOST Latin 20X17H2
Transliteration 20H17N2
By chemical elements 20Cr17Н2
Name The value
Designation GOST Cyrillic 2Х17Н2
Designation GOST Latin 2X17H2
Transliteration 2H17N2
By chemical elements 2Cr17Н2

Description

20KH17N2 steel is used: for the manufacture of heavily loaded details working at the abrasion and impact in slightly aggressive environments such as high strength steel.

Note

Steel corrosion-resistant martensitic class.
20KH17N2 steel has a high hardness (HRC>45).

Standards

Name Code Standards
Processing of metals by pressure. Forgings В03 GOST 25054-81
Classification, nomenclature and General rules В30 GOST 5632-72
Bars and shapes В32 GOST 5949-75, TU 14-11-245-88
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90
Thermal and thermochemical treatment of metals В04 STP 26.260.484-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 5632-72 0.17-0.25 ≤0.025 ≤0.035 ≤0.8 16-18 ≤0.8 1.5-2.5 Rest ≤0.3 ≤0.2 ≤0.2 ≤0.3 ≤0.2
Fe is the basis.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
Forgings. Without heat treatment in the state of delivery
100-300 ≥666 ≥813 ≥12 ≥30 ≥490
Bars hot rolled and forged at STP 26.260.484-2004. Quenching in oil or air from 1000-1050 °C + cold Treatment at minus 70 °C (not less than 2 hours) + Vacation at 250-320 °C, air cooling
≥1200 ≥1500 ≥8 ≥45 ≥490
Bars hot rolled and forged at STP 26.260.484-2004. Quenching in oil or air with 975-1020 °C + Vacation at 680-700 °C, air cooling
≥650 ≥850 ≥16 ≥45 ≥490

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
y The relative narrowing
KCU Toughness

Technological properties

Name The value
Features of heat treatment Steel products can be subjected to hardening, leave, annealing. The quenching and tempering of the products is done to achieve: a) maximum corrosion resistance; b) the specified level of mechanical properties. Steel products 20KH17N2 is subjected to heat treatment regime: heating up to 975-1020 °C exposure time 1-2 h, cooling in oil or air, a holiday at 680-700 °C for 30 min + 1 min per 1 mm of maximum wall thickness.