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Steel grade AISI 304 is the most universal and widely used of all stainless steels. Its chemical and mechanical characteristics, resistance to corrosion and oxidation, as well as weldability characterize its optimal price-performance ratio. This steel has excellent performance properties, resistant to intergranular corrosion in the high temperature zone.

Application area.

Industrial equipment in the chemical, mining, cryogenic, dairy, food and pharmaceutical industries; containers and reservoirs for a variety of dry and liquid materials.

Steel properties

The production of steel sets the following specific characteristics that predetermine its use and subsequent processing:

-rotary drawing, deep drawing;

-Improved weldability;

-Tensile forming

-Heat resistance Ti, C (titanium, carbon)

-narburizing. Increased strength.

-mechanical processing.

Percent composition 304 L .

Mechanical characteristics of AISI304 steel at room temperature.

The strength of austenitic steel, if necessary, can be increased by:

- adding nitrogen to the steel

- Strengthening in the steelworks (by repeated rolling; by stretching; by tungsten carbide bending; by pressure)

Stainless nitriding steel is used in particular in such applications as large columns, tanks, shipping containers, where the highest design steel strength (Rp0.2) makes it possible to reduce wall thickness and achieve savings in material costs. Other uses of form-strengthened austenitic AISI304 steel are various molding plates intended for the manufacture of vehicles, keg hoops, welded pipes, chains, strips and supporting elements.

Performance at High Temperatures

Tensile strength at elevated temperatures

Minimum value of elastic limit at high temperatures (strain in 10,000 hours in 1% at the given temperature)

Dross formation temperature:

-in continuous exposure 925oC;

-in continuous exposure 850oC; -in intermittent exposure 850oC.

Characteristics of AISI 304 steel at low temperatures:

Corrosion resistance.

-acidic media.

Examples are given for some acid solutions and acids

Code:

- Corrosion rate less than 100 mm/year. High degree of protection = 0
- Corrosion rate 100m - 1000 mm/year. Partial protection = 1
- Corrosion rate greater than 1000 mm/year. Non resistant=2

Heat treatment

Annealing at 1010-1120°C and rapid cooling with water or cool air, to make the steel as malleable as possible. The best corrosion resistance is obtained by annealing at 1070°C and abrupt cooling.

2. Stress relieving (tempering) at 450-600°C for one hour with little risk of sensitization. The lowest stress-relief temperature of 400°C maximum shall be used.

3. Forging Range. Temperature at the beginning of the process - 1150 - 1260 °C, at the end of the process - 900 - 925 °C. For all hot workmanship - accompanied by annealing. The time to achieve homogeneous heating of stainless steels is longer than that of carbon steels, about 12 times longer.

4 Cold work

This steel is both strong and ductile. Cold working includes tensile forming, bending, rotary and deep drawing. Cold working uses the same tools and techniques as for carbon steel. However, the applied mechanical forces increase by 1.5-2 times. This is due to the hardening of austenitic steel during forming.

Tensile forming

The processing technology implies that the billet is subjected to "braking" during the stretching process. The walls of the billet are thinned, so heat-strengthened steels are used during forming to avoid tearing.

Rotary and deep drawing

During true deep drawing on the press, the billet is not stretched, which does not happen often in practice, the material passes freely between the rolls. Household utensils, for example, are always stretched when drawing. In this case, the alloy for deep drawing, should be characterized by a minimum degree of hardening, that is, be as stable as possible, and the indicator Md30 (N) should be "on minus". For the production of kitchen stainless steel appliances, the so-called sub-analysis of rolled stainless steel is usually used, as in the production of saucepans, by deep drawing. Rotary drawing on a lathe is shaping with turning. Standard objects of use are, for example, buckets or similar symmetrical tapered products, which are not normally polished.

7. Welding.

AISI304 steel is easy to weld.

As a rule, heat treatment after welding is not required. However, if there is a risk of intergranular corrosion, additional annealing at 1050-1150°С is carried out. The weld should be cleaned of scale by mechanical and chemical means - with etching paste.

Buy at the best price

Evek GmbH has a wide range of stainless steel products in stock. Our representative offices are located. You can make a purchase without leaving your office, through the Company's website. The popularity of the brand AISI304 is explained by a variety of assortment and low cost. All products have the highest quality. Technological completeness of each stage of production makes it possible for us to fulfill individual orders in case you are not satisfied with the basic execution of the product. We carry out high quality individual orders of non-standard parameters, the timing of their implementation is minimal. In case of bulk purchases we provide discounts.