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Steel 70S2KHA (ЭИ142)

Designation

Name The value
Designation GOST Cyrillic 70С2ХА
Designation GOST Latin 70C2XA
Transliteration 70S2HA
The chemical elements 70С2Cr
Name The value
Designation GOST Cyrillic ЭИ142
Designation GOST Latin EI142
Transliteration EhI142
The chemical elements -

Description

70S2KHA steel is used: for the manufacture of springs for watches; large springs for critical applications; cold-rolled heat-treated ribbon with a thickness of 0.05 to 1.30 mm and rolled heat-treated strip thickness 0.15−2.00 mm for the manufacture of spring details and springs, with the exception of the crown; measuring tapes.

Note

Steel spring alloy of high quality.

Standards

Name Code Standards
Sectional and shaped rolling В32 GOST 14959-79, TU 14-1-2118-77, TU 14-1-505-73, TU 14-11-245-88, TU 14-136-367-2008
Tapes В34 GOST 2283-79, GOST 21996-76, GOST 21997-76, TU 3-939-81, TU 14-1-2992-80
Steel wire medium- and high-carbon В72 GOST 26366-84

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu
GOST 14959-79 0.65-0.75 ≤0.025 ≤0.025 0.4-0.6 0.2-0.4 1.4-1.7 ≤0.25 The rest ≤0.2
Fe is the basis.
According to TU 14-1-505-73, by agreement of the parties for special purpose hardware, steel should be supplied with reduced content limits of elements without treatment with synthetic slag and purging with argon.

Mechanical characteristics

Section, mm σB, MPa d4 HV, MPa
Tape cold-rolled heat-treated (0,05-1,30 mm) for spring parts and springs according to GOST 21996-76 and flattened strip (0,15-2,00 mm) according to GOST 21997-76 (listed group strength tape)
- 1270-1570 - 375-485
- 1580-1860 - 486-600
- ≥1860 - ≥600
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
0.1-4 780-1180 - -
0.1-4 ≤880 ≥8 -

Description mechanical marks

Name Description
Section Section
σB Limit short-term strength
d4 Elongation after rupture
HV The Vickers hardness

Technological properties

Name The value
Weldability Does not apply to welded structures.
Propensity to temper brittleness Tend not.
Flock-sensitive sensitivity not sensitive.
Features of production Rod on the other 14-1-505-73 comes Beloretsky metallurgical plant.

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