IS 3195:1992 52Cr4Mo2V Steel: Specifications & Listings
IS 3195:1992 52Cr4Mo2V: Hot-rolled chromium-molybdenum-vanadium high-grade spring steel 52Cr4Mo2V to IS 3195:1992 (third revision) as amended (Amendments 1 and 2), supplied as flats and rounds for volute and helical springs for railway rolling stock; the springs are worked hot and heat-treated. Maximum hardness in the annealed condition is 255 HB; the untreated hardness is about 310 HB for guidance. Listed in the 1992 text as 51CrMoV4 and renamed by Amendments 1 and 2.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Cr
Mn
Mo
P
S
Si
V
0.48-0.56
0.90-1.20
0.70-1.10
0.15-0.25
<=0.030
<=0.030
0.15-0.40
0.07-0.12
Mechanical Properties
Hardness, annealed
<=255 HB
Hardness, untreated (hot rolled)
about 310 HB (for guidance only)
More data from IS 3195:1992
From the standard
Other composition limitsfrom the table notes and clauses
Values
Maximum unless a range is given (ladle analysis, as replaced by Amendment No. 1)
Product analysis, permitted variation over the limit
C plus or minus 0.03, Mn plus or minus 0.04, Si plus or minus 0.03 (plus or minus 0.05 above 0.40), S plus or minus 0.005, P plus or minus 0.005, Cr plus or minus 0.03, V plus or minus 0.02, Mo plus or minus 0.03 percent
Product analysis rule
The variation does not apply both over and under the limits in several determinations in one heat
Incidental elements
Elements not quoted are not added intentionally without the purchaser's agreement, other than to finish the heat; elements from scrap that affect hardenability, mechanical properties or applicability are guarded against
Limiting bar diameter for springs (guidance)
Recommended for bars up to 47.5 mm
Steel making
Any process except the Bessemer process, followed by secondary refining or vacuum melting
Reduction ratio, minimum
16 to 1 from the ingot or continuous cast billet to the product; other ratios by agreement
Inclusion rating (IS 4163:1982), maximum
2.0 for A, B, C and D, thick and thin series (2.5 in the 1992 text, changed by Amendment No. 1)
Ladle analysis by IS 228 or another established method; the IS 228 method is the referee method. The 1992 text recommended bars up to 38 mm and 47.5 mm for this grade; Amendment No. 1 (1995) gives 47.5 mm. Amendment No. 1 lowered the sulphur and phosphorus maxima for this grade to 0.030 (0.040 or 0.035 in the 1992 text). Designation history: 51CrMoV4 in the 1992 text, 51CrMoV by Amendment No. 1 (1995), 52Cr4Mo2V by Amendment No. 2 (2000) in Table 1 and note (f); Table 2 and clause 8.6.2 still read 51CrMoV after Amendment No. 1. In the scan of Amendment No. 1 the last digit of the upper carbon limit is smudged (0.54 or 0.56); the 1992 text and the best reading give 0.56.
Source: IS 3195:1992 with Amendments 1 and 2, Table 1 (as replaced by Amendment No. 1), clauses 5, 6 and 9
Hardness by condition2 conditions
Untreated (hot rolled), for guidance only
about 310 HB
Annealed, maximum
255 HB
Hardness is tested to IS 1500:1983 on 2 percent of the bars of the same section and cast; the average of three readings must meet the limit (clause 13.2). For hot-rolled material other hardness limits may be agreed at enquiry and order (clause 7.1.1).
Source: IS 3195:1992 with Amendments 1 and 2, Table 2, clauses 7.1, 7.1.1 and 13.2
For this high-grade steel only partial decarburization is permitted at these depths; complete decarburization is not permitted (clause 8.6.2). No decarburization, partial or total, is permitted on centreless ground bars (clause 8.6.3). Examined at 100 times magnification as per IS 6396:1983; 2 percent of the bars of the same section, and of each annealed batch, are tested (clauses 8.5 and 13.4).
Source: IS 3195:1992 with Amendments 1 and 2, Table 3, clauses 8.6.2 and 8.6.3
Delivery condition and straightness3 conditions
Delivery condition (by agreement)
As-rolled and straightened; annealed and straightened; precision ground and peeled
Out of straightness, maximum
1.5 mm per metre for hot-rolled bars; 1.0 mm per metre for peeled and centreless ground bars
Surface
May be coated with a thin layer of anti-rust oil when agreed
Flats and rounds for volute and helical springs; the bars are worked hot and heat-treated by the spring maker. Peeled and centreless ground bars are supplied straightened (clauses 11.4 and 14).
Source: IS 3195:1992 with Amendments 1 and 2, clauses 11.4 and 14
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