Leaf and volute springs, road and railway vehicle springs including helical and plat spring. This steel is capable of taking up a good hardness and possesses an increased stability in tempering.

Typical Analysis In %

C Si Mn Cr W V Co Mo Ni
0.50/0.60 1.50/2.00 0.70/1.00 - S&P each 0.05 (max) - -


Heat Treatment & Processing

Forging Temp. °C Annealing Temp. °C Hardening Temp. °C Quenching Medium Tempering Temp. °C Hardness Rockwell °C
900-830 650-680 830-860 O 470-540 BHN 235


Equivalent Grades

BS 970 (REVISED) 1970-1972 BS 970-1955 En No. AISI/SAE DIN Japan U.S.S.R. IS
250A53 45 9255 55Si7 - 55C2
Grade Specification
T55Si7 3749/1978
High duty volute and leaf springs, Heavy engine valve springs, helical and torsional bar springs. It has a high ratio of yield point to tensile strength and high torsional fatigue strength.

Typical Analysis In %

C Si Mn Cr W V Co Mo Ni
0.45/0.55 0.5 0.50/0.80 0.80/1.20 - 0.15 (max) S&P each 0.05 (max) -


Heat Treatment & Processing

Forging Temp. °C Annealing Temp. °C Hardening Temp. °C Quenching Medium Tempering Temp. °C Hardness Rockwell °C
900-830 650-680 830-860 O 470-540 BHN 235


Equivalent Grades

BS 970 (REVISED) 1970-1972 BS 970-1955 En No. AISI/SAE DIN Japan U.S.S.R. IS
735A50 47 6150 50CrV4 - -
Grade Specification
T50Cr4V2 3749/1978

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