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Mat.No. 1.7176 DIN 55Cr3 SAE 5155 55CrMnA SUP9 Spring Steel

Mat.No. 1.7176 DIN 55Cr3 SAE 5155 55CrMnA SUP9 Spring Steel SUP9 Mat.No. 1.7176 DIN 55Cr3 SAE 5155 55CrMnA SUP9 Spring Steel Mat

Mat.No. 1.7176 DIN 55Cr3 SAE 5155 55CrMnA SUP9 Spring Steel

Applications:

Steel grade for laminated springs thickness above 7 mm for trucks and railway vehicles, coiled and threaded springs.

Quality Standard:

JIS G4801 2005 Spring Steels
BS EN 10089 2002 Hot rolled steels for quenched and tempered springs
ASTM A29 Standard Specification Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements

All Grades Comparison:

Material No. EN BS AFNOR JIS ASTM GB
1.7176 55Cr3 525A58, 525H60 55C3 SUP9 5155 55CrMnA

Chemical Composition(%)

Steel Grade C Si Mn P S Cr
5155 0.51-0.59 0.15-0.35 0.70-0.90 0.035 max 0.040 max 0.75-1.00
55Cr3 0.52-0.59 0.40 max 0.70-1.00 0.025 max 0.025 max 0.70-1.00
SUP9 0.52-0.60 0.15-0.35 0.65-0.95 0.030 max 0.030 max 0.65-0.95
SUP9A 0.56-0.64 0.15-0.35 0.70-1.00 0.030 max 0.030 max 0.70-1.00
55CrMnA 0.52-0.60 0.17-0.37 0.65-0.95 0.025 max 0.025 max 0.65-0.95

HEAT TREATMENT:

  • FORGING:Hot forming temperature: 1050 – 850°C.
  • SOFT ANNEALING: Heat to 640 – 680°C, cool slowly in furnace. This will produce a maximum Brinell hardness of 248.
  • HARDENING: Harden from a temperature of 830 – 860°C followed by oil quenching.
  • TEMPERING:Tempering temperature: 430 – 500°C, air.

Mill′s test certificate:

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.