304 stainless steel grade: 0Cr18Ni9(0Cr19Ni9) 06Cr19Ni9 S30408 Chemical composition: C: ≤0.08, Si: ≤1.0 Mn: ≤2.0, Cr: 18.0~20.0, Ni: 8.0~10.5, S: ≤0.03, P: ≤0.035 N≤ 0.1. Folding and 304L304L are more corrosion resistant, 304L contains less carbon. 304 has a wide range of uses, with good corrosion resistance, heat resistance, low temperature strength and mechanical properties; good hot workability such as stamping and bending, no heat treatment hardening phenomenon (non-magnetic, use temperature -196°C~800°C). 304L after welding or stress relief, its resistance to intergranular corrosion; in the case of no heat treatment, it can also maintain good corrosion resistance, the use temperature -196°C-800°C. The basic situation of folding is divided into two types: hot rolling and cold rolling according to the manufacturing method. According to the structural characteristics of the steel type, it is divided into 5 categories: austenite type, austenite-ferrite type, ferrite type, martensite type, precipitation hardening type. It is required to withstand the corrosion of various acids such as oxalic acid, sulfuric acid-iron sulfate, nitric acid, nitric acid-hydrofluoric acid, sulfuric acid-copper sulfate, phosphoric acid, formic acid, acetic acid, etc. It is widely used in chemicals, food, medicine, papermaking, petroleum, atomic energy, etc. Industry, as well as various parts and components of construction, kitchenware, tableware, vehicles, and household appliances. The stainless Steel Plate has a smooth surface, high plasticity, toughness and mechanical strength, and is resistant to corrosion by acids, alkaline gases, solutions and other media. It is an alloy steel that is not easy to rust, but it is not rust-free. Stainless steel plates are divided into two types, hot-rolled and cold-rolled according to the production method, including thin cold plates with a thickness of 0.02-4 mm and medium-thick plates with a thickness of 4.5-100 mm. In order to ensure that the mechanical properties such as yield strength, tensile strength, elongation and hardness of various stainless steel plates meet the requirements, the steel plates must undergo annealing, solution treatment, aging treatment and other heat treatments before delivery. Corrosion mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, etc.) and internal structure, and the main role is chromium. Chromium has high chemical stability and can form a passive film on the surface of the steel to isolate the metal from the outside world, protect the steel plate from oxidation, and increase the corrosion resistance of the steel plate. After the passivation film is destroyed, the corrosion resistance decreases.
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