The Indian automotive industry runs on fatigue-driven parts — gears, crankshafts, axles, bearings — where a single internal inclusion can become a warranty claim three years later. Saroj Enterprise supplies the case-hardening, high-tensile and bearing grades the sector specifies, each bar ultrasonically tested to ASTM A388 before it leaves our yard.
Automotive component manufacturers — gear-makers, transmission ancillaries, engine-component suppliers, bearing units — work to two pressures that the steel supplier has to solve: fatigue-life integrity on every bar, and predictable supply across OEM build schedules. Both come back to the same answer: clean material, on time, with paperwork that holds up.
Our case-hardening stock (EN353, 20MnCr5, SAE 8620, EN36C) covers the gear and shaft side of the line. Our through-hardening alloy stock (EN19, EN24, AISI 4140) covers the highly-stressed shafts, connecting rods and high-strength fasteners. EN31 covers the bearing side. And every bar — every order, no exceptions — ships with an EN 10204 Type 3.1-equivalent MTC and an ASTM A388 UT pass report, both keyed to the heat number for full traceability.
This matters because in automotive QA, the certificate is not optional. Incoming inspection wants the document before the bar lands. We work that way by default.
The finished parts that start out as Saroj round, square, hex or forged bar — with the grades typically specified for each.
Carburised spur, helical and bevel gears — the heart of every gearbox. Demand a hard, wear-resistant case over a tough core.
Heavily loaded rotating parts with complex stress patterns. Need high tensile strength, good toughness and clean internals.
Long, large-diameter shafts that transmit torque under shock loading. Through-hardening alloy is the standard call.
High-cycle fatigue parts. Either heat-treated alloy or case-hardened depending on configuration.
Engine, wheel and transmission bearings — fatigue-critical, where internal cleanliness directly determines L10 life.
Why each grade earns its place on a typical automobile bill of materials. Click any for full composition, properties and equivalents.
The default Indian automotive case-hardening grade for transmission gears and pinions. Hard case, tough core, predictable heat treatment.
Manganese-chromium carburising steel — the European OEM standard for precision automotive gears. Fine grain, consistent hardenability.
Global standard nickel-chromium-molybdenum carburising steel. Used wherever an international specification calls for 8620 in the gear or shaft.
High-nickel case-hardening steel — used where the core must take exceptional impact. Heavy gears, crankshafts requiring hard surfaces.
Nickel-chromium-molybdenum through-hardening alloy steel for heavily stressed shafts, crankshafts and aircraft-grade components.
Chromium-molybdenum direct-hardening — the economical workhorse for high-tensile automotive shafts and gear shafts.
High-carbon high-chromium bearing steel — the global standard for ball and roller bearings. UT-tested in our yard, every order.
The American name for EN19's chemistry. Specified on drawings from American OEMs or where 4140 is in the BOM.
Automotive parts fail through fatigue, and fatigue starts at internal inclusions. Ultrasonic examination on every bar is exactly the right kind of insurance for this sector.
Your incoming inspection wants the certificate before the bar. We ship both documents with every consignment — EN 10204 3.1 equivalent, signed by independent QA.
We work on annual contracts and scheduled call-offs, holding dedicated stock against forecasts. We are not a one-off-only supplier.
Five automatic CNC saws up to 600 mm. Your blanks arrive sized for production, not for the saw shop. Less waste, less handling, faster throughput.
EN353, 20MnCr5, SAE 8620, EN19, EN24, EN31 — held in the volumes Indian automotive ancillaries actually need, across the full diameter range.
Four decades of automotive supply means we know when EN353 is the right call and when 20MnCr5 will hold up better. Ask before you specify.
For carburised gears and shafts: EN353, 20MnCr5, SAE 8620 and EN36C. For high-tensile shafts, connecting rods and high-strength bolts: EN19 (AISI 4140) and EN24 (AISI 4340). For bearings, bearing rings, balls and rollers: EN31 (52100 / 100Cr6 / SUJ2). For dies and tool-room use within auto ancillaries: D2, H13 and OHNS.
Both. We supply Tier-1 and Tier-2 automotive ancillaries directly, and also serve as the steel source for component manufacturers building parts for OEMs. For OEM customers we offer annual contracts and scheduled call-offs against forecast volumes.
Most automotive failures in service start at sub-surface inclusions or cavities in the steel — defects that ordinary inspection cannot see. ASTM A388 ultrasonic examination screens each bar for these defects before dispatch. For fatigue-critical parts like bearings, gears and crankshafts, it is the single most important quality step.
Yes. Our standard certificate is EN 10204 Type 3.1 equivalent. For OEM contracts that require third-party witness — typically for export or high-criticality applications — we can arrange EN 10204 Type 3.2 equivalent documentation. Specify on the inquiry.
For stocked grades and sizes, same-day quote and dispatch within 3 to 7 days is typical. For scheduled call-offs against an annual contract, we dispatch on the agreed cycle. For non-stock items or large forged sections, we give a realistic lead time at the quotation stage.
Share your grade, size, quantity and delivery schedule. We work to your line.
