Forged Leaf Springs, Torsion Bars & Disc Springs for Automotive & Rail
Shivam Forge manufactures precision hot-forged spring steel components — leaf spring blanks, torsion bar forgings, stabilizer bar blanks, parabolic spring blanks and disc spring blanks — at our Shapar GIDC facility in Rajkot, Gujarat. We work in 65Mn, SUP9, 55Si2Mn, EN45, 60Si2Mn and SAE 9260 spring steel grades with in-house oil hardening, tempering and shot peening capabilities.
Spring fatigue is not caused by incorrect hardness alone — it is caused by stress concentrations, surface defects and incorrect grain flow introduced during manufacture. Hot forging of spring steel in correctly controlled dies eliminates the surface seams, decarburisation and micro-cracks that plague rolled and cut spring blanks, giving forgings a measurably higher fatigue life. Shivam Forge has supplied spring steel forgings to commercial vehicle OEMs, tractor manufacturers and railway component suppliers across India for over 20 years.
Forged leaf spring blanks for trucks, buses and trailers in SUP9 and 55Si2Mn spring steel. Eye ends, centre bolt holes and clip notches are forged near-net. Camber set to drawing specification after heat treatment. Weight range 2–80 kg per leaf.
Tapered-section parabolic spring blanks for light commercial vehicles and modern truck suspensions. 60Si2Mn and SAE 9260 grades. Variable cross-section forged to maintain constant stress distribution — far superior to cut-taper blanks machined from flat bar.
Solid and hollow torsion bar forgings in EN45 and SAE 9260 for passenger car, SUV and light truck suspension systems. Splined or hexagonal end details forged near-net. Twist pre-set and shot peened after heat treatment for extended fatigue life.
Forged stabilizer bar blanks and end links in 65Mn and SAE 9260 for passenger car and commercial vehicle anti-roll bar assemblies. Correct grain flow through the bend radii — the highest-stress zone on any stabilizer bar — is the key advantage of the forged blank.
Precision-forged disc spring blanks in 60Si2Mn and EN45 for industrial clutch packs, valve springs and preload applications. Flatness tolerance held to ±0.1 mm before heat treatment. Finished to DIN 2093 Group 1, 2 and 3 dimensions.
Leaf spring blanks and torsion spring forgings for tractor front axle and cab suspension systems. SUP9 and 55Si2Mn grades. Supplied as forged blanks or heat-treated to 420–450 HB ready for shot peening and assembly.
Spring steel is forged in the narrow 1050–1150°C window where silicon-manganese grades have adequate ductility without grain coarsening. Tight temperature control prevents decarburisation of the surface layer — a primary cause of premature spring fatigue failure.
Leaf spring and torsion bar forgings are austenitised at 860–900°C and oil quenched to achieve full martensite, then tempered at 400–450°C to reach 420–480 HB (equivalent to 1250–1500 MPa tensile strength). Temperature uniformity across the furnace batch is verified for every heat treatment run.
Shot peening (S230–S330 steel shot, Almen intensity 0.25–0.40A) introduces compressive residual stress at the spring surface to depths of 0.2–0.4 mm. This is the most effective single process improvement for spring fatigue life, closing incipient surface cracks before they can propagate.
Leaf spring forgings are press-cambered to the free-camber dimension specified in the customer drawing after heat treatment. Torsion bars are pre-twisted beyond the elastic limit (scragging) to stabilise the working stress range and eliminate set-in-service.
Decarburisation depth is checked per batch by metallographic section — surface carbon must not fall below 0.45% at 0.1 mm depth per our process specification. Decarburised material is cause for rejection regardless of dimensional compliance.
We work in 65Mn, SUP9, 55Si2Mn, EN45, 60Si2Mn and SAE 9260 — all major spring steel grades used in Indian and export commercial vehicle markets. Grade selection advice is available based on load cycle, operating temperature and corrosion environment.
Our spring steel forgings supply commercial vehicle OEMs, tractor manufacturers and railway component suppliers across India. We understand the documentation, material certification and batch traceability requirements of OEM procurement.
We manufacture disc spring blanks and coil spring forgings for railway buffer springs and draft gear preload applications per RDSO specifications. Spring steel forging for railway applications requires close control over hardness uniformity — we achieve ±10 HB across any one batch.
Every spring steel forging lot ships with a material certificate (mill heat analysis + spectrometric verification), heat treatment record with temperature and time charts, hardness test report and dimensional inspection report. Full traceability from steel heat to finished forging.
India's spring steel forging industry is concentrated in Rajkot and Pune. Shivam Forge's Shapar GIDC location gives access to skilled forging labour, local spring steel stockholders and port logistics to Mundra and Nhava Sheva for export. Indian spring steel forgings are typically 30–45% below European pricing.
New die manufacture in 2–3 weeks. First article forgings from new dies within 4 weeks of drawing approval. Production quantities of 200–10,000 pieces per month with delivery lead time 4–6 weeks for standard grades from stock.
Shivam Forge is a spring steel forging manufacturer at Shapar GIDC, Rajkot, Gujarat, producing hot-forged spring components for commercial vehicles, tractors, railway systems and industrial machinery. Our product range covers leaf spring blanks for trucks, trailers and buses in SUP9 and 55Si2Mn; parabolic spring blanks in 60Si2Mn and SAE 9260; torsion bar forgings in EN45 and SAE 9260; stabilizer bar blanks in 65Mn; and disc spring blanks in EN45 and 60Si2Mn. All grades are heat-treated in-house by oil hardening and tempering to 420–480 HB, with shot peening and camber setting available.
The fundamental advantage of hot-forged spring blanks over cut-from-bar alternatives is grain flow continuity. In a forged leaf spring blank, the metal flow follows the geometry of the part — through the eye ends, around the centre section taper, and out to the tip. This continuous grain flow means that the highest-stress locations on the spring (eye end transition radii, centre bolt boss) are also the locations with the most favourable grain orientation. Shot peening adds a further layer of protection by introducing compressive residual stress at the surface to depths of 0.2–0.4 mm, preventing surface crack initiation under cyclic load.
Decarburisation control is the detail that separates serious spring steel forging manufacturers from generic forging shops. Silicon-manganese spring steels (55Si2Mn, 60Si2Mn) are particularly prone to surface decarburisation at forging temperature because silicon reduces the carbon activity at the surface. At Shivam Forge, we control furnace atmosphere during heating and limit soak time at temperature. Every batch is checked by metallographic section — surface carbon must not fall below 0.45% at 0.1 mm depth. Decarburised material is rejected regardless of hardness test results.
For Indian commercial vehicle and tractor OEMs, spring steel forging sourcing from Rajkot offers real supply chain advantages. Our Shapar GIDC location is close to major CV assembly plants in Gujarat and Maharashtra, and within 120 km of Mundra port for export. Our spring steel blanks go through forging, heat treatment, shot peening and inspection under one roof, eliminating the subcontractor logistics that add lead time and create quality documentation gaps. Delivery for standard grades from stock is 4–6 weeks for production quantities, and 2–3 weeks for repeat orders with approved first articles.
Shivam Forge supplies spring steel forgings to 500+ OEM and aftermarket customers across India and exports to 12+ countries. Our ISO 9001:2015 quality system generates full documentation for every lot: mill heat certificate with spectrometric verification, heat treatment chart with temperature-time records, hardness test report (3 readings per piece on the first 10 pieces of each heat treatment batch), shot peening Almen strip records and dimensional inspection report. To get a quotation for leaf spring blanks, torsion bar forgings or disc spring blanks, contact us at +91 92657 72827 or email sales@shivamforge.com.
We forge 65Mn, SUP9, 55Si2Mn, EN45, 60Si2Mn and SAE 9260 spring steel grades. Grade selection depends on required fatigue life, operating temperature and corrosion exposure. Our technical team can advise on grade selection for your application.
Price depends on the steel grade, part geometry, heat treatment requirement and quantity. As a rough guide, leaf spring blanks in SUP9 for commercial vehicles range from ₹80–150 per kg for production quantities above 500 pieces. Contact us at +91 92657 72827 or sales@shivamforge.com for a specific quotation.
Shivam Forge at Shapar GIDC, Rajkot is a leading spring steel forging manufacturer with 20+ years of experience, ISO 9001:2015 certification, in-house oil hardening and shot peening, and supply to Indian and export OEMs. We manufacture leaf spring blanks, torsion bar forgings, disc spring blanks and stabilizer bar blanks.
Yes. We perform oil hardening and tempering in-house, achieving 420–480 HB on most commercial vehicle spring steel grades. We also shot peen finished springs and set camber to customer drawing. Heat treatment records (temperature-time charts, hardness certificates) are provided with every batch.
Yes. We manufacture truck and trailer leaf spring blanks in SUP9 and 55Si2Mn from 2 kg to 80 kg per leaf, including parabolic (variable thickness) profiles. Eye ends, centre bolt holes and load pad features are forged near-net. Supplied as forged, heat-treated, or shot-peened and cambered.
For existing die profiles, minimum order is 50 pieces. For new die development, we typically request a first-article run of 10–25 pieces before moving to production. We are flexible for R&D and prototype requirements — call +91 92657 72827 to discuss your requirement.
Yes. We export spring steel forgings to 12+ countries including the Middle East, Africa, Southeast Asia and Europe. Export shipments include full material certifications, heat treatment records and dimensional reports. We can ship via Mundra or Nhava Sheva port.
Send your part drawing (PDF, STEP or IGES) with steel grade, heat treatment specification, required quantity and delivery port to sales@shivamforge.com or call +91 92657 72827. We will respond with a quotation within 24 hours.
Why Choose Shivam Forge
Shivam Forge delivers precision hot-forged components from our integrated Shapar, Rajkot facility — covering forging, CNC machining, heat treatment, and quality inspection under one roof.
