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BS 970 (Part 1) 535A99 vs IS 1570 (Part 4) 105Cr5

Close Alternative — 84.3% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 535A99 (BS 970 (Part 1):1983) and IS 1570 (Part 4) 105Cr5 (IS 1570 (Part 4):1988) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 535A99 is defined under British Standards (BS), originating from United Kingdom, while IS 1570 (Part 4) 105Cr5 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 970 (Part 1) 535A99 vs IS 1570 (Part 4) 105Cr5 is a 84.3% 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 84.3%.

Frequently Compared With BS 970 (Part 1) 535A99:
NF A35-565 100C6 UNI 11234 100Cr6 GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
84.3%
MECHANICAL MATCH
No shared data
OVERALL
84.3%
Specifications
Property BS 970 (Part 1) 535A99 IS 1570 (Part 4) 105Cr5
Standard BS 970 (Part 1):1983 IS 1570 (Part 4):1988
Category Alloy Steel Alloy Steel
C (%) 0.95-1.10 0.90-1.20
Mn (%) 0.40-0.70 0.40-0.80
P (%) <=0.035 Not specified
S (%) <=0.040 Not specified
Cr (%) 1.20-1.60 1.00-1.60
Si (%) Not specified 0.10-0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
BS 970 (Part 1) 535A99
Used for aircraft fittings, gears, high-strength shafts, crankshafts, heavy-duty fasteners, and transmission parts.
IS 1570 (Part 4) 105Cr5
Not documented
Key Differences
Can BS 970 (Part 1) 535A99 Be Substituted With IS 1570 (Part 4) 105Cr5?
BS 970 (Part 1) 535A99 and IS 1570 (Part 4) 105Cr5 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
BS 970 (Part 1) 535A99
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–6400 mm (204.72–251.97 in)
IS 1570 (Part 4) 105Cr5
No active listings currently.
On M-EX Right Now
BS 970 (Part 1) 535A99
2 active listings and RFQs →
IS 1570 (Part 4) 105Cr5
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 1) 535A99 and IS 1570 (Part 4) 105Cr5?
BS 970 (Part 1) 535A99 specifies P, S which are not specified for IS 1570 (Part 4) 105Cr5. IS 1570 (Part 4) 105Cr5 specifies Si which is not specified for BS 970 (Part 1) 535A99.
Can BS 970 (Part 1) 535A99 be substituted with IS 1570 (Part 4) 105Cr5?
BS 970 (Part 1) 535A99 and IS 1570 (Part 4) 105Cr5 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.