Get quick answers regarding thermal cycle limits, material recommendations, and testing protocols from our metallurgy experts.
We process a wide range of steel alloys, low carbon steels, tool steels, and engineering iron castings. This includes case carburizing steels (like 20MnCr5, EN353), medium carbon steels (EN8, EN9, EN19), and custom high alloy steels for industrial tool components.
Our largest pit-type furnace (GCF-3) features a working diameter of 750 mm and a vertical working depth of 1400 mm. Components fitting within these dimensions can be processed comfortably. For specific batch weights, please consult our engineering team.
Our metallurgical inspection lab is equipped with Rockwell Hardness testers, Brinell Hardness testers (up to 3000Kg load), a Rockwell-cum-Brinell tester, Metallurgical Microscope, Micro Hardness testers, Portable Hardness testers, and metallographic sample preparation polishing machines.
Yes. G R B Quality Heat Treaters is fully certified under ISO 9001:2015 standards, ensuring that all our operations, documentation, calibrations, and metallurgical testing protocols adhere to strict international quality management standards.
Case depth is evaluated both non-destructively on check-pieces (witness coupons) and destructively via micro-structural cross-section analysis. We slice the check coupon, polish it metallographically, and verify the effective case depth using our metallurgical microscopes or microhardness testers.
To prevent oxidation during annealing, we replace ambient oxygen inside the furnace retort with protective controlled atmospheres like nitrogen, argon, or forming gas. Alternatively, vacuum annealing can be performed to completely eliminate oxygen, yielding scale-free, bright surfaces.
Gas carburizing uses positive atmospheric pressure hydrocarbon gas in a retort, which is highly cost-effective and suitable for deep case depths. Vacuum carburizing uses low-pressure acetylene inside a vacuum chamber, which eliminates intergranular oxidation (IGO), guarantees excellent case depth uniformity in blind holes, and produces minimal dimensional distortion when combined with gas pressure quenching.
NADCAP compliance ensures that heat treatment operations adhere strictly to rigorous aerospace quality standards. This includes maintaining tight pyrometry instrumentation compliance, executing regular Temperature Uniformity Surveys (TUS) of furnaces, and performing system accuracy tests (SAT) in accordance with the AMS 2750 standard.
Case carburizing is a thermochemical process where carbon is diffused into low-carbon steel components (soaking in a gas atmosphere inside a pit furnace), followed by quenching. This hardens complex geometry surfaces evenly. Induction hardening uses electromagnetic coils to heat and quench localized areas of medium carbon steel, suitable for rapid processing of simple shaft surfaces without changing the steel's chemical composition.
Our office is open from Monday to Saturday, 9:00 AM to 9:00 PM. Our furnace shop floor runs continuously based on batch heating cycle demands to maintain production consistency.
