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GOST 4543 20HN2M vs BS 970 (Part 1) 805A20

Close Alternative — 80.4% match based on chemical composition and mechanical property overlap.

GOST 4543 20HN2M (GOST 4543-2016) and BS 970 (Part 1) 805A20 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. GOST 4543 20HN2M is typically used for used for gears, pinions, shafts, rollers, and automotive transmission parts., while BS 970 (Part 1) 805A20 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties).. BS 970 (Part 1) 805A20 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, GOST 4543 20HN2M vs BS 970 (Part 1) 805A20 is a 80.4% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 80.4%.

Frequently Compared With GOST 4543 20HN2M:
NF A35-565 100C6 GOST 4543 12HN3A UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr6
Match Breakdown
CHEMISTRY MATCH
80.4%
MECHANICAL MATCH
No shared data
OVERALL
80.4%
Specifications
Property GOST 4543 20HN2M BS 970 (Part 1) 805A20
Standard GOST 4543-2016 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.17-0.24 0.18-0.23
Cr (%) 0.4-0.7 0.40-0.60
Ni (%) 1.4-1.8 0.40-0.70
Mo (%) 0.15-0.25 0.15-0.25
Mn (%) 0.5-0.8 0.70-0.90
P (%) Not specified <=0.035
S (%) Not specified <=0.040
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GOST 4543 20HN2M BS 970 (Part 1) 805A20
Tensile Strength 880-1080 MPa Not specified
Yield Strength 735 MPa min Not specified
Elongation 11% min Not specified
Hardness 58-62 HRC (case) Not specified
Typical Applications
GOST 4543 20HN2M
Used for gears, pinions, shafts, rollers, and automotive transmission parts.
BS 970 (Part 1) 805A20
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can GOST 4543 20HN2M Be Substituted With BS 970 (Part 1) 805A20?
GOST 4543 20HN2M and BS 970 (Part 1) 805A20 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
GOST 4543 20HN2M
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5600–6000 mm (220.47–236.22 in)
BS 970 (Part 1) 805A20
No active listings currently.
On M-EX Right Now
GOST 4543 20HN2M
2 active listings and RFQs →
BS 970 (Part 1) 805A20
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Frequently Asked Questions
What is the difference between GOST 4543 20HN2M and BS 970 (Part 1) 805A20?
BS 970 (Part 1) 805A20 specifies P, S which are not specified for GOST 4543 20HN2M.
Can GOST 4543 20HN2M be substituted with BS 970 (Part 1) 805A20?
GOST 4543 20HN2M and BS 970 (Part 1) 805A20 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.