AISI 304 L
Mark AISI 304 L
This is the most versatile and widely used of all steel from stainless steel. Its chemical and mechanical properties, good weldability, corrosion resistance and oxidation are an example of optimum price-performance ratio. This steel has excellent low temperature properties and is recommended for use with the risk of intergranular corrosion in high temperature zone.
— Industrial equipment in the chemical, mining, cryogenic, dairy, food and pharmaceutical industries;
— Containers and tanks for a variety of dry and liquid substances.
— Any machining
— heat resistance
— Rotary extractor, deep drawing;
— Improved weldability
— Forming and stretching
— Increased strength work hardening.
The percentage of 304 L.
Mechanical characteristics of AISI 304 L steel at room temperature.
|The elastic limit Rp 0,2, (0.2%), N / mm2 (fluidity)||170||310|
|Tensile strength Rp m, N / mm2 (tensile)||485||590|
|A5 elongation to break in%||40||60|
|Fatigue strength, N / mm2||-||240|
|Brinell Hardness — HB||-||170|
The strength of the austenitic steel can be increased if necessary by means of:
· Addition of nitrogen into the steel (for example 304LN)
· Formouprochneniya factory steel (repeated temper rolling, stretching, work hardening, pressure)
Nitrided stainless steel especially applicable to such large objects as columns, tanks, transportation containers, wherein the calculated greatest strength steel (Rp0,2) makes it possible to reduce the wall thickness, as well as to achieve savings in material costs. Also the use of other areas of application of austenitic steel AISI 304 L subjected formouprochneniyu are a variety of molding boards, intended for the manufacture of vehicle wraps for kegs, welded pipes, chains, rails and support members.
Characteristics at high temperatures
Tensile strength at elevated temperature
|Tensile strength (tensile), Rp m N / mm2||380||270||170||90||50|
|Temperature, ° C||600||700||800||900||1000|
The minimum value of the elastic limit at high temperatures (strain 10% 000 h c1 at a given temperature)
|Temperature, ° C||Time||800||700||650||600||550|
|Rp1,0 1.0% plastic deformation (flow), N / mm2||10,000 hours||10||thirty||50||80||120|
|Rp1,0 1.0% plastic deformation (flow), N / mm2||100,000 hours||5||25||50||80||120|
-with continuous exposure to 925oC;
-with intermittent exposure to 850 ° C.
Examples of some acid solutions and acids
|The concentration of mass in%||10||20||40||60||80||100|
|The concentration of mass in%||10||20||40||60||80||100|
— High degree of protection 0 =
— Partial protection 1 =
— Non resistant = 2
Characteristics of AISI 304 L steel at low temperatures:
|Elastic limit, (0.2%), Rp0,2 (yield strength) N / mm2||N / mm2||380/220||300/180||400/220|
|Tensile strength (tensile), Rp m, N / mm2||N / mm2||1450/1200||1100/950||1600/1350|
Annealing at t ° 1010 — 1120 ° C and quenching with water or cool air maximizes the processability of steel. The best corrosion resistance is achieved by annealing 1070 ° C and rapid cooling. Stress Relief (vacation) at 450−600 ° C for one hour, increase the risk of sensitization. It must be used the lowest temperature stress relief — a maximum of 400 ° C. The temperature at the start of the forging process: 1150 — 1260 ° C, at the end of the process — about 900 — 925 ° C. If any required hot processing a joke. Time designed to achieve uniformity of warming up of stainless steel for longer than about 12 carbon time.
This steel is both strong and ductile. Cold treatments include stretching forming, bending, rotary and deep drawing. When cold working is applied are the same tools and techniques, as for a carbon steel. However, applied mechanical forces increase by 1.5−2 times. This is due to hardening of austenitic steel with the molding.
processing technology provides that the workpiece is subjected to during the 'braking' hoods. The walls of the workpiece thinner, so the molding in order to avoid gaps used heat treatable steel.
Rotary and deep drawing
When this deep drawing press on the workpiece is not stretched, and the material passes freely between the rollers. For example, when drawing household utensils forming always a stretch. In this alloy for deep drawing, must be different minimum degree of hardening, that is, to be as stable and the rate of Md30 (N) must be «in the red». For the production of stainless steel kitchen appliances typically used so-called Sub-analysis of stainless steel, as in the production of cooking pots by deep drawing. Rotary drawing on metal-spinning machine is forming a turning. Such objects may be a bucket or similar products symmetrical cone, which is usually not polished.
It suffices easily welded. Generally, the heat treatment after welding is not required. But at the risk of intergranular corrosion is performed additional annealing at t ° 1050−1150 ° C. The welding seam must be cleaned chemically and mechanically descaled and then passivated by means of etching paste.
All products are in AISI 304 L certified. The technical documentation includes data on the chemical composition, limiting the percentage of impurities; mechanical properties of products. We can buy in bulk, any semi-finished products for large-scale productions. We also offer optimal conditions for retail customers. High level of service and efficiency of service are the face of our company.
Buy at the best price
In stock company «Electrovek-steel» is represented by a diverse range of stainless steel alloys. We supply certified products of domestic and foreign manufacturers. Our staff members are always happy to provide expert assistance in the selection of metal-roll. We employ some of the most experienced management consultants. Strict compliance with the rules of production, excellent product quality and minimal lead times are the face of our company. For regular customers introduced discount prices.