AISI 309S, 1.4833 pipe
The basic qualities
Heat-resistant and heat-resistant steel AISI 309S has a broad scope, for example, the heating elements of the resistance. This steel is prone to embrittlement due to the formation of oxides at a temperature of 600−800°C, and the start of intensive scaling occurs at t° 1050 °C. At high temperature, high Nickel content with chromium provides high strength and excellent oxidation resistance. AISI 309S has a light weldability — which gives it wide application. The use of steel is recommended for temperatures up to 1000 °C.
AISI 309 S relevant in the production of various parts operated at high temperatures and lightly condition (furnace conveyors, furnace fittings, boxes for carburizing at temperatures of up to 950°C), metallurgical, mining, chemical, oil and gas. Also steel grade AISI 309 S used in the heating elements of the resistance. It is widely used in all environments at high temperatures, where it is necessary high corrosion resistance, excellent creep resistance and heat resistance.
The percentage 309 S.
|counterparts, and brand||Ti||V||Cu||N||Ni||Fe||Mo||S||P||Mn||C||Cr||Si|
|1.4833||<0,11||12,0 — 14,0||Basis||<0,015||<0,045||<2,0||<0,15||22,0 — 24,0||<1,0|
|20x23н13||<0,2||Of <1.00||12,0 — 15,0||Basis||<0,3||<0,025||<0,035||<2,0||<0,20||22,0 — 25,0||<1,0|
|309S||<0,2||12,0 — 15,0||Basis||<0,030||<0,045||<2,0||<0,08||22,0 — 24,0||<1,5|
With high temperatures steel
|Strength limit N/mm2 (tensile), Rp m||390||329||280||230||190||140|
|Temperature in °C||600||650||700||750||800||850|
Mechanical characteristics at room temperature steel 309S.
|The elastic limit. N/mm2 Rp 0,2, (0.2%), (turnover)||205||280|
|Limit durable. m Rp N/mm2(tensile)||515||580|
|The relative elongation A80 to break in %||40||60|
|Fatigue resistance, N/mm2||-||260|
|Brinell hardness — HB||-||156|
The minimum value of the limit of elasticity at high temperature (strain B1% for a set time at a given temperature).
|plastic deformation Rp1,0 to 1.0% (turnover), in N/mm2||10 000 h||10||40||70||100||180|
|plastic deformation Rp1,0 to 1.0% (turnover), in N/mm2||100 000 h||5||25||50||80||120|
Elasticity until failure (yielding)
|h 10 000||MPa Stress||10||50||90||130||240|
|h 1 000||MPa Stress||30||70||140||180||270|
|h 100 000||MPa Stress||5||15||50||90||200|
The maximum temperature of the service. recommended.
the impact of continuous 1150°C
intermittent exposure 1035°C
-Partial protection is equal to 1. The corrosion rate 100m to 1000 mm/year.
— High degree of protection equal to 0. The corrosion rate of 100 mm/year.
— Non resistant equal to 2. The corrosion rate свыше1000 mm/year.
Treatment of thermal
The range of forging. The beginning of the process t°. — 1150 — 1260 °C, the end of the process. t°.900−925°C. the Period of time estimated to obtain a homogeneous heating of stainless steels longer than carbon-12. Relief (or release) method of autogene without showing deposition of carbide is in a temperature range of 450−800o C. thus, the departure from microlimano possible corrosion. Gradual lowering of the temperature necessary to safeguard the allocation of carbon. The annealing is carried out at t°1020 — 1120 °C, cooling and the sharp intake of cool air, providing maximum ductility of the steel.
Due to its strength, this steel finds a variety of use. Typical operations include bending, forming by stretching, rotating and deep hood. At the time of molding using the same tools as for carbon steels. In this case, it will take much more effort is approximately 1.5−2 times. This makes babout thegreater degree of hardening when forming austenitic steel, but in certain cases may also serve as a negative factor.
During deep drawing of the workpiece to the press was not subjected to «braking», and give freely to pass in the instruments in practice, however, this happens not so often. For example, always takes place forming with stretching in the manufacture of the cookware. The material, which is subjected to deep drawing must have when forming a low degree of hardening, i.e. to be stable at the maximum, and the rate of Md30 (N) have to be «in the red». For kitchens stainless steel appliances are typically used so-called sub-tests of stainless steel stock as in the production of pots by deep drawing. In flow-forming machine rotary extractor means forming with the turning.
In the period of forming, stretching is subjected to a preset «inhibition». Its walls become very thin during forming, to avoid a gap, preferably of steel to provide the characteristics of high strengthening.
Steel AISI 309S lends itself to easy welding. Heat treatment, usually after welding is not required. But, at the risk of intergranular corrosion at the temperature. 1050−1150°C to produce additional autogenie. Seam welding must be cleaned of chemical and mechanical means from scale, passivated etching paste its end.
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