Duplex Solid Round Discs Hot Forging Quenched Tempered Machined Steel Disc

Duplex Solid Round Discs Hot Forging Quenched Tempered Machined Steel Disc
 

Duplex stainless steel refers to a material whose microstructure is composed of two phases: ferrite phase and austenite phase, each accounting for approximately 50%. In actual use, it is more appropriate for one of them to be between 40-60%.

According to the characteristics of the two-phase structure, through correct control of chemical composition and heat treatment process, the excellent toughness and weldability of austenitic stainless steel are combined with the higher strength and chloride stress corrosion resistance of ferritic stainless steel. , making duplex stainless steel a type of steel that combines many excellent properties such as excellent corrosion resistance, high strength and ease of processing and manufacturing. Their physical properties are between austenitic stainless steel and ferritic stainless steel, but closer to ferritic stainless steel and carbon steel. The resistance to chloride pitting and crevice corrosion of duplex stainless steel is related to the chromium, molybdenum and nitrogen content. Its pitting and crevice corrosion resistance can be similar to 316 stainless steel, or higher than seawater stainless steel such as 6% MO austenitic stainless steel. . All duplex stainless steels are significantly more resistant to chloride stress corrosion cracking than 300 series austenitic stainless steels, and their strength is also much higher than austenitic stainless steels, while showing good plasticity and toughness.

1. Compared with austenitic stainless steel

1. The yield strength is more than twice that of ordinary austenitic stainless steel, and it has sufficient plastic toughness required for forming. The thickness of storage tanks or pressure vessels made of duplex stainless steel is 30-50% lower than that of commonly used austenitic stainless steel, which is beneficial to reducing costs.
2. It has excellent resistance to stress corrosion cracking, especially in environments containing chloride ions. Even duplex stainless steel with the lowest alloy content has a higher resistance to stress corrosion cracking than austenitic stainless steel. Stress corrosion is Outstanding problems that are difficult to solve with ordinary austenitic stainless steel.
3. The corrosion resistance of the most common 2205 duplex stainless steel in many media is better than that of ordinary 316L austenitic stainless steel, while super duplex stainless steel has extremely high corrosion resistance. In some media, such as acetic acid and formic acid It can even replace high-alloy austenitic stainless steel and even corrosion-resistant alloys.
4. It has good local corrosion resistance. Compared with austenitic stainless steel with the same alloy content, its wear corrosion resistance and corrosion fatigue performance are better than austenitic stainless steel.
5. The linear expansion coefficient is lower than that of austenitic stainless steel and close to that of carbon steel. It is suitable for connection with carbon steel and has important engineering significance, such as the production of composite plates or linings.

2. Compared with ferritic stainless steel, the advantages of duplex stainless steel are as follows:

1. The comprehensive mechanical properties are higher than those of ferritic stainless steel, especially the plastic toughness. Not as sensitive to brittleness as ferritic stainless steels.
2. In addition to stress corrosion resistance, other local corrosion resistance properties are better than ferritic stainless steel.
3. Cold working process performance and cold forming performance are far superior to ferritic stainless steel.
4. The welding performance is much better than that of ferritic stainless steel. Generally, no preheating is required before welding and no heat treatment is required after welding.
5. The application range is wider than that of ferritic stainless steel.

Application

Due to the high strength of duplex steel, it can often save material, such as reducing the wall thickness of pipes. Take SAF2205 and SAF2507W as examples. SAF2205 is suitable for chlorine-containing environments. This material is suitable for refining or other process media mixed with chlorides. SAF2205 is particularly suitable for heat exchangers using chlorine-containing aqueous solutions or brackish water as cooling medium. The material is also suitable for dilute sulfuric acid solutions and pure organic acids and their mixtures. Such as: oil pipelines in the oil and gas industry: crude oil desalination in refineries, sulfur-containing gas purification, wastewater treatment equipment; cooling systems using brackish water or chlorine-containing solutions.

DINGSCO

Hunan Dinghan New Material Technology Co., Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications.We are dedicated to providing our customers with best quality products, fastest possible deliveries, most competitive prices of Nickel Based Corrosion Resistant and High Temperature alloys in bars, rods, forged flanges, valve parts (Ball, Stem, Seat Ring, etc), forged shapes (shafts, discs, blocks, hubs, rings, cylinders and other custom shapes) according to ASTM, ASME, API, AMS, NACE and other industry standards.

 
PROFESSIONAL NICKEL ALLOY MANUFACTURER

• Monel, Incoloy, Inconel, Hastelloy
• VIM, ESR, Forging, Heat treatment, Machining
• Round Bar, Ball, Stem, Ring, Flange, etc
• ISO9001, API-6A, API-20B, PED, NORSOK

 
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