Carbon Steel Castings for Surface Hardening

This document establishes comprehensive technical requirements and test methods for the surface hardening of carbon steel castings. It defines the applicable scope for various casting components intended to withstand wear and abrasion through controlled surface modification processes. The text outlines specific heat treatment procedures necessary to achieve the desired hardness gradients without compromising the structural integrity of the base material. Detailed criteria are provided for the selection of carburizing or nitriding techniques, including the management of heating rates, holding times, and cooling rates. It further specifies the methods for hardness testing across different sections of the treated surface to ensure consistency with the defined performance benchmarks. The document addresses potential defects arising from improper treatment and offers guidelines for their prevention. It also includes provisions for the verification of case depth and microstructure changes resulting from the hardening process. These specifications serve as a reference for manufacturers and quality control personnel involved in the production of durable carbon steel castings, ensuring uniformity and reliability in the final products across the industry. The guidelines cover the preparation of specimens and the interpretation of test results to maintain adherence to the established technical parameters.