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IS 6603:2024 X39Cr17Mo1 Steel: Specifications & Listings

IS 6603:2024 X39Cr17Mo1: X39Cr17Mo1: martensitic corrosion resisting stainless steel, numerical symbol 434C. Specified in IS 6603:2024.

Category: Stainless Steel
Grade Details
GradeIS 6603:2024 X39Cr17Mo1
Standard IS 6603:2024
ApplicationsGeneral purposes, semi-finished products, bars, wire rods and bright bars
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
EN 10088-1 X39CrMo17-1 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-2 X39CrMo17-1 EN 10088-2:2014 Europe No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
EN 10088-1 X39CrMo17-1 EN 10088-1:2014 Strong Match
EN 10088-1 X39CrMo17-1 EN 10088-1:2023 Strong Match
EN 10088-2 X39CrMo17-1 EN 10088-2:2014 Strong Match
EN 10088-3 X39CrMo17-1 EN 10088-3:2014 Strong Match
EN 10088-3 X40CrMoVN16-2 EN 10088-3:2014 Close Alternative
BS 970 (Part 1) 416S21 BS 970 (Part 1):1991 Related Material
BS 970 (Part 1) 416S29 BS 970 (Part 1):1991 Related Material
BS 970 (Part 1) 416S37 BS 970 (Part 1):1991 Related Material
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Si Mn P S Cr Mo Ni
0.33-0.45 <=1.00 <=1.50 <=0.040 <=0.015 15.5-17.5 0.80-1.30 <=1.00
Mechanical Properties
Tensile Strength <=900 MPa
Hardness <=280 HB
Condition Soft annealed (+A), conditions 1C, 1E, 1D, 1X, 1G and 2D, all sizes; hardness as printed

More data from IS 6603:2024

From the standard
Mechanical properties by heat treatment condition 2 rows
Thickness or diameter (mm)ConditionHardness HBRp0.2 min (MPa)Rm min (MPa)Rm max (MPa)A min, longitudinal (%)A min, transverse (%)KV2 min, longitudinal (J)KV2 min, transverse (J)
-+A280--900----
up to 160+QT-55075095012-10-
+A = soft annealed, +QT = quenched and tempered; for larger thickness the values shall be agreed upon.
Source: IS 6603:2024, Table 8
Bright bars, annealed and quenched and tempered 5 rows
Thickness or diameter (mm)Annealed Rm max (MPa)Annealed HB max (information)Quenched and tempered Rp0.2 min (MPa)Quenched and tempered Rm (MPa)A5 min, longitudinal (%)A5 min, transverse (%)KV2 min, longitudinal (J)KV2 min, transverse (J)
up to 101000340650800 to 10508---
over 10 to 161000340600800 to 10508---
over 16 to 40980310550750 to 100010-14-
over 40 to 63930290550750 to 95012-14-
over 63 to 160900280550750 to 95012-10-
Bright bars, conditions 2H, 2B, 2G or 2P; quenched and tempered condition +QT.
Source: IS 6603:2024, Table 18
Proof strength at elevated temperature 7 temperatures
Temperature (deg C)Rp0.2 min, +QT (MPa)
100540
150535
200530
250520
300510
350490
400470
Minimum values, quenched and tempered; for guidance only.
Source: IS 6603:2024, Table 13
Hot forming and heat treatment 2 conditions
ConditionAnnealing temperature (deg C)Cooling after annealingQuenching temperature (deg C)Quenching mediumTempering temperature (deg C)
+A750 to 850furnace, air---
+QT--980 to 1060oil650 to 750
Hot forming 1100 to 800 deg C, cooling: slow cooling. Informative guideline (Annex A).
Source: IS 6603:2024, Table 23

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