Post Stock Login Register

SAE J404 4130 vs BS 970 (Part 1) 708A30

Strong Match — 89.6% match based on chemical composition and mechanical property overlap.

SAE J404 4130 (SAE J404:2009) and BS 970 (Part 1) 708A30 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. SAE J404 4130 is typically used for aircraft structures, pressure vessels, high tensile tubes, while BS 970 (Part 1) 708A30 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6.. SAE J404 4130 is defined under SAE International, originating from United States, while BS 970 (Part 1) 708A30 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, SAE J404 4130 vs BS 970 (Part 1) 708A30 is a 89.6% 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 89.6%.

Frequently Compared With SAE J404 4130:
NF A35-565 100C6 UNI 11234 100Cr6 GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 12Cr9Mo10H IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 7) 12Cr4Mo5H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5
Match Breakdown
CHEMISTRY MATCH
89.6%
MECHANICAL MATCH
No shared data
OVERALL
89.6%
Specifications
Property SAE J404 4130 BS 970 (Part 1) 708A30
Standard SAE J404:2009 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.28-0.33 0.28-0.33
Cr (%) 0.80-1.10 0.90-1.20
Mn (%) 0.40-0.60 0.40-0.60
Mo (%) 0.15-0.25 0.15-0.25
P (%) <=0.030 <=0.035
S (%) <=0.040 <=0.040
Si (%) 0.15-0.35 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
SAE J404 4130
Aircraft structures, pressure vessels, high tensile tubes
BS 970 (Part 1) 708A30
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Key Differences
Can SAE J404 4130 Be Substituted With BS 970 (Part 1) 708A30?
SAE J404 4130 and BS 970 (Part 1) 708A30 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708A30 is often considered as a substitute for SAE J404 4130 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
SAE J404 4130
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5700–6400 mm (224.41–251.97 in)
BS 970 (Part 1) 708A30
No active listings currently.
On M-EX Right Now
SAE J404 4130
2 active listings and RFQs →
BS 970 (Part 1) 708A30
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between SAE J404 4130 and BS 970 (Part 1) 708A30?
SAE J404 4130 specifies Si which is not specified for BS 970 (Part 1) 708A30.
Can SAE J404 4130 be substituted with BS 970 (Part 1) 708A30?
SAE J404 4130 and BS 970 (Part 1) 708A30 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708A30 is often considered as a substitute for SAE J404 4130 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.