Local stress-strain method.
The basic idea of the local stress-strain method is to analyze the local stress at the notch with the help of the local stress-strain method according to the nominal stress history of the structure. Then, according to the local stress at the notch, combined with the S-N curve of the component and the cycle of the material. A curve, an e-n curve and a linear cumulative damage theory are used to estimate the fatigue life of the structure.
The basic assumption is that if the stress-strain course of the dangerous part (point) of a component is the same as the stress-strain course of a smooth small specimen, the life span is the same. In this method, the local stress-strain is the control parameter.
Product Introduction
The following are typical chemical composition and mechanical properties (ASTM) references.
The minimum value of the mechanical properties of the alloy at room temperature
This alloy has the following properties:
Hasteloy G-30 is a nickel-based alloy with a high chromium content that provides superior corrosion resistance to commercial phosphoric acid and mixed environments of many highly oxidizing acid media such as nitric acid, hydrochloric acid, nitric acid, hydrofluoric acid and sulfuric acid compared to most other nickel- and iron-based alloys.
G-30 prevents the formation of grain boundary precipitation in the weld heat-affected zone, so its welded form is suitable for a variety of chemical treatment applications.
Process performance and requirements for UNS N06030:
Heat Treatment: Unless otherwise specified, forgings of Hastaloy G-30 alloy are heat treated with solid melt. The melt heat treatment temperature is 1177 heat, followed by rapid air cooling or water quenching. Hot stamped parts should be melt heat treated before final manufacturing and installation.
Forming: G-30 alloy has very good machinability, and it is best to use cold working forming. Due to its good toughness, it is easy to cold work. The alloy is typically harder than austenitic stainless steels and therefore requires more energy when cold working.
UNS N06030 welding
Hasteloy G-30 alloy can be welded by tungsten inert gas arc welding (GTAW), metal gas arc welding (GMAW) and electrode arc welding. Its welding properties are similar to those of Hastaloy G-3 alloy. We do not recommend the use of submerged arc welding, which is characterized by a high heat input to the base metal and slow cooling.
Base metal preparation: Before welding, the joint surface and its adjacent areas must be thoroughly cleaned. All oils, greases, powders, sulfides and other substances must be removed.
Selection of welding filler materials: When welding, filler metal materials with matching compositions are allowed. We recommend using G-30 welding wire (Ernicrmo-11;UNS N06030) for tungsten inert gas arc welding and metal gas arc welding with a G-30 alloy electrode (ENICRMO-11;UNS W06030).
The UNS N06030 is used in the following areas:
Phosphoric acid equipmentSulfuric acid equipmentNitric acid equipment.
Nuclear Fuel ReprocessingNuclear Waste DisposalPickling operations.
PetrochemicalsFertilizer productionPesticidesGold ore extraction.