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BS 970 EN30A vs IS 1570 (Part 4) 30Ni16Cr5

Close Alternative — 73.7% match based on chemical composition and mechanical property overlap.

BS 970 EN30A (BS 970:1955) and IS 1570 (Part 4) 30Ni16Cr5 (IS 1570 (Part 4):1988) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN30A is defined under British Standards (BS), originating from United Kingdom, while IS 1570 (Part 4) 30Ni16Cr5 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 970 EN30A vs IS 1570 (Part 4) 30Ni16Cr5 is a 98.1% match. As per mechanical properties, the match is 25%. Combined, this makes them a close alternative overall at 73.7%.

Frequently Compared With BS 970 EN30A:
UNI 11234 100Cr6 NF A35-565 100C6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
98.1%
MECHANICAL MATCH
25%
OVERALL
73.7%
Specifications
Property BS 970 EN30A IS 1570 (Part 4) 30Ni16Cr5
Standard BS 970:1955 IS 1570 (Part 4):1988
Category Alloy Steel Alloy Steel
C (%) 0.26-0.34 0.26-0.34
Si (%) 0.10-0.35 0.10-0.35
Mn (%) 0.40-0.60 0.40-0.70
Ni (%) 3.90-4.30 3.90-4.30
Cr (%) 1.10-1.40 1.10-1.40
S (%) <=0.050 Not specified
P (%) <=0.050 Not specified
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 EN30A IS 1570 (Part 4) 30Ni16Cr5
Tensile Strength ≥1544 MPa (100 tons/sq in, converted) >=1540 MPa
Yield Strength ≥1313 MPa (85 tons/sq in, converted) >=1240 MPa (0.2 % proof stress)
Elongation ≥10% >=8%
Hardness 444 HB >=444 HBS (guidance only)
Condition Air hardened and tempered (lowest-strength condition of the standard) Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 150 (oil hardened) mm
Izod Impact Not specified >=14 J
Typical Applications
BS 970 EN30A
Used for gears, aircraft components, transmission shafts, heavy-duty pinions, crankshafts, and high-strength fasteners.
IS 1570 (Part 4) 30Ni16Cr5
Not documented
Key Differences
Can BS 970 EN30A Be Substituted With IS 1570 (Part 4) 30Ni16Cr5?
BS 970 EN30A and IS 1570 (Part 4) 30Ni16Cr5 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 EN30A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6400–6600 mm (251.97–259.84 in)
IS 1570 (Part 4) 30Ni16Cr5
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On M-EX Right Now
BS 970 EN30A
2 active listings and RFQs →
IS 1570 (Part 4) 30Ni16Cr5
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Frequently Asked Questions
What is the difference between BS 970 EN30A and IS 1570 (Part 4) 30Ni16Cr5?
BS 970 EN30A specifies S, P which are not specified for IS 1570 (Part 4) 30Ni16Cr5.
Can BS 970 EN30A be substituted with IS 1570 (Part 4) 30Ni16Cr5?
BS 970 EN30A and IS 1570 (Part 4) 30Ni16Cr5 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.