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BS 970 (Part 1):1991 805A17 Steel: Specifications & Listings

BS 970 (Part 1):1991 805A17: 805A17 is a case hardening steel specified in BS 970 Part 1:1991 (category 2).

Category: Alloy Steel
Grade Details
GradeBS 970 (Part 1):1991 805A17
Standard BS 970 (Part 1):1991
ApplicationsCase hardening steel (section four)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
SAE J404 8617 SAE J404:2000 USA No activity yet
BS 970 (Part 1) 805M17 BS 970 (Part 1):1991 UK No activity yet
BS 970 (Part 1) 805A17 BS 970 (Part 1):1983 UK No activity yet
IS 11169 (Part 1) 17Ni2Cr2Mo2 IS 11169 (Part 1):2022 India No activity yet
SAE J404 8615 SAE J404:2009 USA 0 listings, 2 RFQs →
SAE J404 8620 SAE J404:2009 USA 6 listings, 5 RFQs →
IS 1570 (Part 4) 20Ni2Cr2Mo2 IS 1570 (Part 4):1988 India No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 1) 805A17 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 805M17 BS 970 (Part 1):1991 Strong Match
SAE J404 8617 SAE J404:2009 Strong Match
SAE J404 8617 SAE J404:2000 Strong Match
BS 970 (Part 1) 805A20 BS 970 (Part 1):1983 Strong Match
IS 11169 (Part 1) 17Ni2Cr2Mo2 IS 11169 (Part 1):2022 Strong Match
BS 970 (Part 1) 805A22 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 805M17 BS 970 (Part 1):1983 Strong Match
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Mn Cr Mo Ni P S
0.15-0.20 0.70-0.90 0.40-0.60 0.15-0.25 0.40-0.70 <=0.035 <=0.035
Mechanical Properties
Condition Case hardened, 19 mm test bar
Tensile Strength 770 MPa min
Elongation 12 % min

More data from BS 970 (Part 1):1991

From the standard
Other composition limits
Category
Category 2 steel
Other limits
P 0.035 max.; S 0.035 max.
Category 1 steels are preferred for new designs and established designs (clauses 1.4 and 2.1). Category 2 steels are printed in italic type.
Source: BS 970 (Part 1):1991, Table 8
Core properties after case hardening, by test bar diameter
Test bar diameter (mm)Tensile strength, min (MPa)Elongation, min (%)Impact Izod, min (ft lb)Impact KCV, min (J)
19770122022
Properties of simulated case hardened test bars (clause 1.13.3.4). 1 N/mm2 = 1 MPa. Note 29: these are new steels which may have been conservatively rated due to limited data.
Source: BS 970 (Part 1):1991, Table 8

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