904L is a highly corrosion-resistant super austenitic stainless steel, also known as UNS N08904, with excellent corrosion resistance and resistance to stress corrosion cracking. In this article, we will provide detailed information on the chemical composition, production standards, corrosion resistance, typical application areas, processing and heat treatment, machining, welding and other aspects of 904L alloy.
I. Chemical Composition
The chemical composition of 904L alloy is as follows:
Element | Chemical Composition (Mass %)
– | –
Iron (Fe) | Balance
Nickel (Ni) | 23.0-28.0%
Chromium (Cr) | 19.0-23.0
Molybdenum (Mo) | 4.0-5.0
Copper (Cu) | 1.0-2.0
Manganese (Mn) | ≤2.00%
Silicon (Si) | ≤1.00
Phosphorus (P) | ≤0.045
Sulfur (S) ≤0.035
Carbon (C) ≤0.020
Nitrogen (N) ≤0.10%
Second, the production standard
The production standard of 904L alloy includes the following aspects:
1. chemical composition standard: the chemical composition of the alloy should be in accordance with the relevant standards, according to the customer’s requirements for the preparation.
2. Mechanical properties standard: the mechanical properties of the alloy should be in accordance with the relevant standards, such as tensile strength, yield strength, elongation, impact toughness and so on.
3. Processing technology standard: the processing technology of the alloy should comply with the relevant standards, including hot processing, cold processing, heat treatment, machining, welding, etc..
Third, corrosion resistance
904L alloy has excellent corrosion resistance, especially for sulfuric acid, phosphoric acid, chloride, hydrochloric acid and other strong acids. In addition, it also has good resistance to stress corrosion cracking performance and oxidation resistance, can maintain its performance in high and low temperature environment.
Typical applications
904L alloy is widely used in chemical industry, marine engineering, pulp and paper, petrochemical, food processing, pharmaceutical and other fields. It is mainly used in the manufacture of sulfuric acid, phosphoric acid, hydrochloric acid and other strong acid storage tanks, pipelines, heat exchangers, evaporators, condensers, reactors, filters, agitators, pump shafts, valves, spiral plates and other equipment.
V. Processing and heat treatment
The processing and heat treatment of 904L alloy includes the following aspects:
1. thermal processing
904L alloy can be shaped by means of hot working, including forging, rolling, extruding, stretching and so on. In the process of hot working, the processing temperature and deformation speed of the alloy should be controlled to ensure the performance and quality of the alloy.
2. Cold working
904L alloy can be shaped by cold working, including cold drawing, cold rolling, cold extrusion and so on. In the process of cold working, attention should be paid to control the deformation speed and deformation amount of the alloy to ensure the performance and quality of the alloy.
3. Heat treatment
904L alloy can be heat treated, including annealing, solution annealing and quenching. Among them, solid solution annealing can improve the plasticity and toughness of the alloy, and quenching can improve the hardness and strength of the alloy. In the heat treatment process, attention should be paid to controlling the heating temperature, holding time and cooling rate of the alloy to ensure the performance and quality of the alloy.
4. Machining
904L alloy can be processed by machining, such as milling, drilling, turning, cutting and so on. In the machining process, suitable cutting parameters and tools should be selected and suitable cooling methods should be adopted to ensure the surface quality and dimensional accuracy of the alloy.
5. Welding
904L alloy can be welded, including manual electric arc welding, argon arc welding, fused electrode gas shielded welding and so on. In the welding process, should choose the appropriate welding process and welding materials, control the welding temperature and welding speed to ensure the quality and performance of the weld.
Six, recommended welding materials
Recommended welding materials for 904L alloy include the following:
1. ER385 welding wire
2. EN 1.4539 welding rod
3. AWS A5.9 E904L-16 welding rod
4. ER385-15 welding wire
These welding materials have excellent corrosion resistance and welding performance, which can ensure the quality and performance of welded joints.
VII. Range of products available
The range of products available for 904L alloy includes the following:
1. 904L plate/sheet
2. 904L tube/pipe
3. 904L bars/rounds
4. 904L wire/wire rod
5. 904L bolts/nuts
6. 904L flanges/pipe fittings
These products are widely used in chemical industry, marine engineering, pulp and paper, petrochemical, food processing, pharmaceuticals and other fields, and can meet the needs of different customers.
===========================================
www.antonmetal.com
ANTON METAL｜ Your specialty metals manufacturer
Email: dominic@antonmetal.com
Contact No.: +8613132148618(wechat/whatsapp)
Post time: Aug-12-2023
