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BS 970 (Part 1) 805A20 vs IS 4367 20NiCrMo2

Strong Match — 93.9% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 805A20 (BS 970 (Part 1):1983) and IS 4367 20NiCrMo2 (IS 4367:1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 805A20 is typically used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties)., while IS 4367 20NiCrMo2 is commonly used for nickel-chromium-molybdenum case-hardening steel; used for highly stressed gears, shafts, and transmission components requiring high core strength, toughness, and wear-resistant carburized surface. BS 970 (Part 1) 805A20 is defined under British Standards (BS), originating from United Kingdom, while IS 4367 20NiCrMo2 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 970 (Part 1) 805A20 vs IS 4367 20NiCrMo2 is a 93.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 93.9%.

Frequently Compared With BS 970 (Part 1) 805A20:
IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Mo6H IS 11169 (Part 1) 10Ni5Cr4 IS 1570 (Part 4) 105Cr5
Match Breakdown
CHEMISTRY MATCH
93.9%
MECHANICAL MATCH
No shared data
OVERALL
93.9%
Specifications
Property BS 970 (Part 1) 805A20 IS 4367 20NiCrMo2
Standard BS 970 (Part 1):1983 IS 4367:1991
Category Alloy Steel Alloy Steel
C (%) 0.18-0.23 0.18-0.23
Mn (%) 0.70-0.90 0.70-0.90
Cr (%) 0.40-0.60 0.40-0.60
Mo (%) 0.15-0.25 0.15-0.25
Ni (%) 0.40-0.70 0.40-0.70
P (%) <=0.035 <=0.035
S (%) <=0.040 <=0.035
Si (%) Not specified 0.20-0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 (Part 1) 805A20 IS 4367 20NiCrMo2
Tensile Strength Not specified 900 MPa min
Elongation Not specified >=11%
Izod Impact Not specified 41 J min
Hardness (soft annealed) Not specified <=213 HB
Condition Not specified Refined, quenched and stress relieved (core properties), ruling section up to 30 mm
Typical Applications
BS 970 (Part 1) 805A20
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
IS 4367 20NiCrMo2
Nickel-chromium-molybdenum case-hardening steel; used for highly stressed gears, shafts, and transmission components requiring high core strength, toughness, and wear-resistant carburized surface
Key Differences
Can BS 970 (Part 1) 805A20 Be Substituted With IS 4367 20NiCrMo2?
BS 970 (Part 1) 805A20 and IS 4367 20NiCrMo2 overlap closely enough on chemistry and mechanical properties that IS 4367 20NiCrMo2 is often considered as a substitute for BS 970 (Part 1) 805A20 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
BS 970 (Part 1) 805A20
No active listings currently.
IS 4367 20NiCrMo2
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5900–6300 mm (232.28–248.03 in)
On M-EX Right Now
BS 970 (Part 1) 805A20
0 active listings and RFQs →
IS 4367 20NiCrMo2
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 1) 805A20 and IS 4367 20NiCrMo2?
IS 4367 20NiCrMo2 specifies Si which is not specified for BS 970 (Part 1) 805A20.
Can BS 970 (Part 1) 805A20 be substituted with IS 4367 20NiCrMo2?
BS 970 (Part 1) 805A20 and IS 4367 20NiCrMo2 overlap closely enough on chemistry and mechanical properties that IS 4367 20NiCrMo2 is often considered as a substitute for BS 970 (Part 1) 805A20 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.