Mark AISI 321 refers to a heat-resistant corrosion-resistant heat-resistant steel. Instability in the sulfur-containing environments. Recommended use temperature is 600−800 ° C, period of operation at the same time very long. AISI 321 steel and the welds is not susceptible to intergranular corrosion due to titanium additives. Despite this, welded AISI 321 fragments should never used in highly oxidizing environments. Used in the manufacture of welded equipment fittings furnace parts, heat exchangers, retorts, muffles, nozzles and manifolds exhaust systems, pipes, electrodes spark incendiary spark.
The percentage of
|P (max)||Mn (max)||C (max)||S (max)||Ti||Ni||Cr||Si (max)|
|AISI 321||0,045||2.0||0.10||0,015||5 * C-0,5||8,00−11,0||17,0−19,0||1.0|
Heat treatment: air cooling, hardening 1020 — 1100ºC
Density: 7900−8200 kg / m 3
Hardness of steel: HB 10−1 = 179 MPa.
Mechanical characteristics of steel 321 at 20 ° C
Welding of steel: without limits
Mechanical characteristics of the steel at room temperature.
|The elastic limit Rp 0,2, (0.2%), N / mm 2 (fluidity)||205||280|
|Rp m Tensile strength, N / mm 2 (tensile)||515||580|
|A80 the elongation to break in%||40||60|
|Fatigue strength, N / mm 2||-||260|
|Brinell Hardness — HB||-||163|
Characteristics at high temperatures
Tensile strength at elevated temperature
|Tensile strength (tensile), Rp m N / mm2||390||329||280||230||190||140|
|Temperature, ° C||600||650||700||750||800||850|
The elastic limit before break (strength)
|Temperature, ° C||Time||800||700||650||600||500|
|Stress MPa||1000 h||thirty||70||140||180||270|
|Stress MPa||10,000 h||10||50||90||130||240|
|Stress MPa||100 000 h||5||15||50||90||200|
The minimum value of the elastic limit at high temperatures (the scheduled time for the deformation of 1% 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||40||70||100||180|
|Rp1,0 1.0% plastic deformation (flow), N / mm2||100,000 hours||5||25||50||80||120|
The maximum recommended service temperature
intermittent exposure to 810 ° C
continuous exposure to 900 ° C
1. The annealing temperature 1050 — 1150 ° C by quenching with cold air provides maximum strength steel.
2. Stress Relief (release) is performed by annealing in the range of t ° 450−800 ° C, to avoid the formation of carbide grains, which provokes the corrosion at grain boundaries.
3. forging range. First process temperature 1150 — 1250 ° C, at the end — about 950 ° C.
Time designed to achieve uniformity of warming up of stainless steel for longer than carbon — about 12 times. To ensure smooth distribution of carbon is necessary to decrease the temperature.
Good, but due to the inclusion of titanium — harder than 304 / 304L. series 347 are used for welding electrodes (stabilized with niobium) which has improved as compared with steel 308L creep resistance in environments where the operating temperature above 400 ° C.
|hire||Rm (MPa)||Eg.||The size||ReH (MPa)||KCU (kDzh.m2)||ψ? (%)||δ5 (%)|
|annealed wire||1400−1600||ø 8||20|
Manufacture of the equipment oil refining and chemical industry, in the manufacture of equipment operating at high temperatures. Steel AISI 321 is also used in the manufacture of welded equipment such as heat exchangers, pipes, muffles, furnace parts fittings, retorts, pipes exhaust systems and manifolds, spark electrodes spark incendiary. It is also widely used by industries such as the food, textile, pharmaceutical, paper.
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