Stainless Steel Casting and CNC Machining Technology Data

Based on GB/T 42124.3-2025, this document explains the external draft angle, internal draft angle, DA/DB grade, and TP/TM markings for investment casting, and compiles the corresponding angles and linear values for 4–630 mm.

The shrinkage rate of stainless steel precision casting cannot be directly applied as a fixed percentage. This article explains the influence of wax patterns, mold shells, alloy solidification, and cooling on dimensions, and provides methods for mold shrinkage calculation, first-piece measurement, and directional correction.

Can cast steel parts be repaired by welding? This article explains the repair boundaries, welding procedure qualification, post-weld heat treatment, non-destructive testing, and record-keeping requirements for pressure-bearing, low-temperature, and stainless steel castings.

How much does it cost to make a precision casting mold? This article explains the relationship between wax mold structure, materials, core pulling, number of cavities, trial molding, sampling fees, mold life, and batch cost.

Why do stainless steel castings require solution treatment? This article explains the purpose of heat treatment, sensitization, microstructure, deformation, and procurement and acceptance data for castings such as 304, 316L, 2205, and 2507.

Should PT, MT, UT, or RT be chosen for casting flaw detection? This article compares the applicable materials, defect types, testing timing, and acceptance requirements of penetrant testing, magnetic particle testing, ultrasonic testing, and radiographic testing.

How to distinguish between shrinkage cavities, porosity, gas holes, sand holes, and cracks in castings? This article explains the common morphologies, their causes, detection methods, rework boundaries, and acceptance requirements of the procurement drawings.

What do the valve body hydrostatic test, low-pressure airtightness test, and valve seat sealing test check respectively? This article explains the standards such as GB/T 13927 and ISO 5208, leakage levels, common leak points, and procurement acceptance documents.

WCB and WCC are ASTM A216 pressure-bearing carbon steel castings, while LCB and LCC are ASTM A352 low-temperature pressure-bearing cast steels. This article explains the material differences and summarizes the relevant grade systems of GB, EN, JIS, and ISO, as well as considerations for substitution.