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AISI 4340 vs IS 1570 (Part 4) 103Cr4

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

AISI 4340 and IS 1570 (Part 4) 103Cr4 (IS 1570 (Part 4):1988) are both steel grades. Both fall under the Alloy Steel category. AISI 4340 is defined under AISI, originating from United States, while IS 1570 (Part 4) 103Cr4 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, AISI 4340 vs IS 1570 (Part 4) 103Cr4 is a 58.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With AISI 4340:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
58.9%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property AISI 4340 IS 1570 (Part 4) 103Cr4
Standard AISI IS 1570 (Part 4):1988
Category Alloy Steel Alloy Steel
C (%) 0.38–0.43 0.95-1.10
Mn (%) 0.60–0.80 0.25-0.45
Cr (%) 0.70–0.90 0.90-1.20
Mo (%) 0.20–0.30 Not specified
Ni (%) 1.65–2.00 Not specified
Si (%) 0.15–0.35 0.10-0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AISI 4340 IS 1570 (Part 4) 103Cr4
Condition Quenched & Tempered Not specified
Tensile Strength 1000–1200 MPa Not specified
Yield Strength ≥830 MPa Not specified
Elongation ≥12% Not specified
Hardness 285–341 HB Not specified
Typical Applications
AISI 4340
Aircraft parts, heavy duty gears, crankshafts, high tensile bolts
IS 1570 (Part 4) 103Cr4
Not documented
Key Differences
Can AISI 4340 Be Substituted With IS 1570 (Part 4) 103Cr4?
AISI 4340 and IS 1570 (Part 4) 103Cr4 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
AISI 4340
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5900–6800 mm (232.28–267.72 in)
IS 1570 (Part 4) 103Cr4
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On M-EX Right Now
AISI 4340
3 active listings and RFQs →
IS 1570 (Part 4) 103Cr4
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Frequently Asked Questions
What is the difference between AISI 4340 and IS 1570 (Part 4) 103Cr4?
AISI 4340 specifies Mo, Ni which are not specified for IS 1570 (Part 4) 103Cr4.
Can AISI 4340 be substituted with IS 1570 (Part 4) 103Cr4?
AISI 4340 and IS 1570 (Part 4) 103Cr4 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.