IS 3431 55Si7 Steel: Supply & Demand
Buyer RFQ demand against seller listing supply for IS 3431 55Si7, broken down by form. Signals are indicative and derived from listings and RFQs.
Last updated: 16 Oct 2026, 1:00 AM
Live Signal: This grade’s supply and demand by form, from listings and RFQs open right now. Use this to act today. For example, “Is there a buyer gap in this grade’s round bar this week?”
| Form |
Supply |
Demand |
Status |
Price Band (Rs./MT) |
| Round Bar |
2 |
0 |
Low Activity |
Insufficient data
|
Disclaimer: All information on this page is indicative only and derived from posted listings and RFQs on M-EX. It does not constitute a market price quote or investment advice. M-EX and GTE make no representations as to accuracy or completeness. Actual activity depends on quantity, quality, payment terms and other commercial factors agreed between buyers and sellers.
IS 3431 55Si7 is a Spring Steel grade: Hot-rolled silicon spring steel 55Si7 to IS 3431:1982 as amended (Amendments 1 to 3), supplied as bars (also centreless ground or precision bars) and flats for volute, helical and laminated springs for automotive suspension. It through-hardens to at least 54 HRC in oil up to 20 mm round or 16 mm flat, and in the quenched and tempered condition reaches 1320 to 1570 MPa tensile strength. The standard was reaffirmed in 1997 and 2001.
Typical applications: leaf springs,coil springs,automotive suspension springs,industrial springs,washer springs.
Equivalent / Similar Grades (9)
Chemical Composition (%)
| C |
Mn |
P |
S |
Si |
| 0.50-0.60 |
0.80-1.00 |
<=0.045 |
<=0.045 |
1.50-2.00 |
Mechanical Properties
| Core Hardness After Quenching |
>=54 HRC (oil, up to 20 mm round / 16 mm flat) |
| Elongation (quenched and tempered) |
>=6% |
| Hardness, soft annealed |
<=245 HB |
| Hardness, untreated (hot rolled) |
about 270 HB (reference value) |
| Tensile Strength (quenched and tempered) |
1320-1570 MPa |
| Yield Stress (quenched and tempered) |
>=1130 MPa |