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JIS G4104 SCr420 vs BS 970 (Part 1) 530A30

Close Alternative — 82.4% match based on chemical composition and mechanical property overlap.

JIS G4104 SCr420 (JIS G 4104:1979) and BS 970 (Part 1) 530A30 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. JIS G4104 SCr420 is typically used for case hardened gears, shafts, cams, while BS 970 (Part 1) 530A30 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6.. JIS G4104 SCr420 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 1) 530A30 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4104 SCr420 vs BS 970 (Part 1) 530A30 is a 82.4% 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 82.4%.

Frequently Compared With JIS G4104 SCr420:
GOST 4543 12HN3A NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
82.4%
MECHANICAL MATCH
No shared data
OVERALL
82.4%
Specifications
Property JIS G4104 SCr420 BS 970 (Part 1) 530A30
Standard JIS G 4104:1979 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.18–0.23 0.28-0.33
Si (%) 0.15–0.35 Not specified
Mn (%) 0.60–0.90 0.60-0.80
Cr (%) 0.90–1.20 0.90-1.20
P (%) ≤0.030 <=0.035
S (%) ≤0.030 <=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 JIS G4104 SCr420 BS 970 (Part 1) 530A30
Tensile Strength ≥830 MPa Not specified
Case Hardness HRC 58–62 Not specified
Core Hardness HB 235–293 Not specified
Typical Applications
JIS G4104 SCr420
Case hardened gears, shafts, cams
BS 970 (Part 1) 530A30
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Key Differences
Can JIS G4104 SCr420 Be Substituted With BS 970 (Part 1) 530A30?
JIS G4104 SCr420 and BS 970 (Part 1) 530A30 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
JIS G4104 SCr420
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5300–5600 mm (208.66–220.47 in)
BS 970 (Part 1) 530A30
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On M-EX Right Now
JIS G4104 SCr420
2 active listings and RFQs →
BS 970 (Part 1) 530A30
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Frequently Asked Questions
What is the difference between JIS G4104 SCr420 and BS 970 (Part 1) 530A30?
JIS G4104 SCr420 specifies Si which is not specified for BS 970 (Part 1) 530A30.
Can JIS G4104 SCr420 be substituted with BS 970 (Part 1) 530A30?
JIS G4104 SCr420 and BS 970 (Part 1) 530A30 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.