With the rapid advancement of science and technology, more and more industries are placing higher demands on the performance of steel materials, especially those used at high temperatures. Heat-resistant steel is widely used in the manufacture of boilers, steam turbines, power machinery, industrial furnaces, and components operating at high temperatures in industries such as aviation and petrochemicals. The development of heat-resistant steel is closely linked to advances in energy and power machinery. The performance of heat-resistant steel is crucial to the success of new technologies in thermal power generation, atomic energy, aerospace, aviation, petroleum, and chemical industries, and its importance is increasing. Currently, the biggest bottleneck in improving energy efficiency in industries such as civilian nuclear power, thermal power generation, gas-fired power generation, and the petrochemical industry is the availability of metal materials, specifically the development of low-cost, high-performance heat-resistant stainless steel. Developing new heat-resistant stainless steel is not only an effective strategy for energy conservation and emission reduction, but also can alleviate the increasingly scarce nickel resources.
Tensile properties are one of the main performance indicators of metal materials. Among them, parameters such as yield and tensile strength are the most representative mechanical performance indicators of metal materials, and are also important bases for stress calculation in engineering design and mechanical design.
2507 stainless steel (UNS S32750) is a super duplex stainless steel that combines the advantages of austenite and ferrite. It has high strength, excellent corrosion resistance and good weldability and is widely used in harsh environments. The following are its core features:
The processing of stainless steel bars (round bars, square bars, hexagonal bars, etc.) usually includes raw material preparation, forming, heat treatment, finishing and other steps. The specific process is as follows: 1. Raw material preparation Material selection: Common grades: 304, 316, 303 (free cutting), 416 (martensite), 17-4PH (precipitation hardening) Morphology: continuous casting billet, hot rolled billet Inspection: Composition analysis (spectrometer) Surface inspection (cracks, inclusions) 2. Hot processing (hot rolling/forging) (1) Hot rolling Heating: Heat the billet to 1100~1250℃ (austenitizing temperature) Rolling: forming round bars, square bars, etc. through multiple rolling mills Cooling: air cooling or water cooling (controlling grain size) Applicable products: large diameter bars (Φ≥20mm) (2) Forging Free forging: used for small batches and large size bars (such as nuclear power steel) Die forging: production of high-precision special-shaped bars (such as automobile crankshafts) 3. Cold working (cold drawing/cold rolling) (1) Cold drawing (Cold Drawing) Steps: Pickling: Remove hot rolling scale (HNO3+HF mixed acid) Phosphating/lubricating: Reduce drawing friction Drawing: Gradually reduce the diameter through the die (can improve the dimensional accuracy to ±0.02mm) Annealing: Eliminate work hardening (austenitic steel: 1010~1120℃; martensitic steel: 700~800℃) Features: High surface finish (Ra≤0.8μm) Applicable to small diameter bars (Φ1~50mm) (2) Cold rolling Formed by rolling...
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