Material analyze

- Mar 26, 2020-

What is the specific gravity of 304 stainless steel:


It is generally believed that the density of iron plate is 7850 kg / m3, and the density of 304 stainless steel plate is 7930 kg / m3


Volume: 1.5 * 6 * 0.005 = 0.045 cubic meters, so the quality of iron plate: M = pV = 7850 kg / m3 * 0.045 cubic meters = 353.25 kg


Quality of 304 stainless steel plate: M = pV = 7930 kg / m3 * 0.045 m3 = 356.85 kg


304 stainless steel plate features:


304 stainless steel plate has 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 ℃ ~ 800 ℃). 304L stainless steel plate has a much smaller carbon content than 304. 304L is better than 304 in pitting corrosion resistance at welding points or other treated places.


chemical composition:


304 stainless steel grade: 0Cr18Ni9 (0Cr19Ni9) 06Cr19Ni9 S30408


Chemical composition: C: ≤0.08, Si: ≤1.0, Mn: ≤2.0, Cr: 18.0 to 20.0, Ni: 8.0 to 10.5, S: ≤0.03, P: ≤0.035, N≤1.0.


With 304L


304L is more resistant to corrosion, and 304L contains less carbon.


304 is widely used, with good corrosion resistance, heat resistance, low temperature strength and mechanical properties; good hot workability such as stamping and bending, no heat treatment and hardening phenomenon (non-magnetic, use temperature -196 ℃ ~ 800 ℃).


304L has strong resistance to grain boundary corrosion after welding or stress relief; it can also maintain good corrosion resistance without heat treatment. The operating temperature is -196 ℃ ~ 800 ℃.


basic situation


There are two types of hot rolling and cold rolling according to the manufacturing method, and they are divided into 5 types according to the structural characteristics of steel types: austenite type, austenite-ferrite type, ferrite type, martensite type, and precipitation hardening type. Requires resistance to oxalic acid, sulfuric acid-ferric sulfate, nitric acid, nitric acid-qing fu suan, sulfuric acid-copper sulfate, phosphoric acid, formic acid, acetic acid and other acids Industry, as well as various parts of construction, kitchenware, tableware, vehicles, household appliances.


The surface of the stainless steel plate is smooth, has 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 does not rust easily, but it is not absolutely rust-free.


Stainless steel plates are divided into two types: hot rolled and cold rolled according to the manufacturing method, including thin cold plates with a thickness of 0.02-4 mm and medium and 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 types of stainless steel plates meet the requirements, the steel plates must be heat treated before annealing, solution treatment, and aging treatment


The corrosion resistance of stainless steel mainly depends on its alloy composition (chrome, nickel, titanium, silicon, aluminum, etc.) and its internal structure, and the main role is the chromium element. Chromium has high chemical stability, can form a passivation film on the surface of steel, 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.


National standard nature


Tensile strength (Mpa) 520


Yield strength (Mpa) 205-210


Elongation (%) 40%


Hardness HB187 HRB90 HV200


Density of 304 stainless steel 7.93 g / cm3 Austenitic stainless steel generally uses this value


304 stainless steel is a universal stainless steel material, and its rust resistance is stronger than that of 200 series stainless steel materials. High temperature resistance is also better.


304 stainless steel has excellent stainless corrosion resistance and good resistance to intergranular corrosion.


For oxidizing acids, it is found in the experiment that 304 stainless steel has strong corrosion resistance in nitric acid with a concentration ≤65% below the boiling temperature. It also has good corrosion resistance to alkaline solutions and most organic and inorganic acids.


General characteristics:


304 stainless steel plate has a beautiful surface and diversified use possibilities, good corrosion resistance and high strength, so the possibility of thin sheet use is high, high temperature oxidation resistance and high strength, so it can resist fire, normal temperature processing, that is, easy plastic processing, Surface treatment, so simple, simple maintenance, clean, high smoothness, good welding performance.