suggestion for casting standard
suggestion for casting standard
(OP)
I have an extruding machine which has fractured. It is made of grey cast iron. The fractures reveal obvious defects and the surface is very poor. Could someone suggest a standard from USA, UK or Australia that I could refer to so as to judge the condition of the casting?





RE: suggestion for casting standard
ASTM ASTM E 94 Standard Guide for Radiographic Examination
ASTM E 1030 Test Method for Radiographic Examination of Metallic Castings
ASTM E 689 Reference Radiographs for Ductile Iron Castings
RE: suggestion for casting standard
ASTM E48 Standard Specification for Gray Iron Castings
SAE J431 Automotive Gray Iron Castings (Even though the title states "automotive", this spec will give you some insight as to what makes a good casting: microstructure, graphite flake type, and mechanical properties.)
RE: suggestion for casting standard
Radiographic techniques to check the inetrnal integrity have thickness limitations. Ultrasonics also are limited in their ability to detect internal casting defects in gray cast iron.
I would agree with Flesh that you should have a metallurgical analysis of the fracture carried out and a company which does this work should be able to offer advice on quality standards and inspection methods.
RE: suggestion for casting standard
Do mess with the failure surfaces in any way.
You just have to document the failure, photographs by a competent or professional photographer, and point the defects out to the manufacturer and await his comments. Sometime this is hard to do unless someone is hurt or said failure has a potential to hurt someone. The problems come if there is no response from the manufacturer.
I have been involved in several such cases where it turned in to a legal thing very quickly. In every case the owner of the machine received judgement though not as much as I thought was reasonable in most cases.