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Home » Stainless Steel » Product introduction
321 Stainless Steel
- Numbers: 2011030703
- Model: 321
- Producers: China
- Update time: 2011.03.07
- Browse:
Product Description:
Grades of Stainless Steel - Grade 321
SX 321 Technical Data
Summary
SX 321 is a titanium-stabilised version of SX 304, used in particular applications within the sensitizing temperature range. Its resistance to sensitization, coupled with its higher strength at high temperature makes it suitable in application where SX 304 will become sensitized, or where SX 304L has insufficient hot strength. It is not subject to weld decay (intergranular corrosion) when exposed to mildly corrosive environments. However, welded SX 321 must never be used in highly oxidising environments as it is liable to 'Knife-line' attack.
Grades of Stainless Steel - Grade 321
SX 321 Technical Data
Summary
Typical Applications
SX 321 is today used almost exclusively for service within the sensitizing temperature range (450-850oC). In welded ambient temperature applications it has been replaced by SX 304L. Some typical areas of application are:
Furnace components.
Superheater and afterburner parts.
Compensators and expansion bellows.
Chemical Composition (ASTM A240)
| C | Mn | P | S | Si | Cr | Ni | Ti | |
| SX Analysis | 0.08 max | 2.0 max | 0.045 max | 0.030 max | 1.0 max | 17.0 - 19.0 | 9.0 - 12.0 | 5X%C min 0.5 max |
| Typical | 0.06 | 1.2 | 0.020 | 0.020 | 0.5 | 17.5 | 9.4 | 0.48 |
Typical Properties in the Annealed Condition
The properties quoted in this publication are typical of mill Products. Unless otherwise indicated they should not be regarded as guaranteed minimum values for specification purposes.
1. Mechanical Properties at Room Temperature
| Typical | Minimum | |
| Tensile Strength, MPa | 580 | 515 |
| Proof Stress (0.2 % offset), MPa | 280 | 205 |
| Elongation (Percent in Lo = 5.65 So) | 60 | 40 |
| Hardness (Brinell) | 163 | - |
| Endurance (fatigue) limit, MPa | 260 | - |
2. Properties at Elevated Temperatures
Short Time Elevated Temperature Tensile Strength
| Temperature, oC | 600 | 650 | 700 | 750 | 800 | 850 |
| Tensile Strength, MPa | 390 | 329 | 280 | 230 | 190 | 140 |
Creep data
Stress to develop a creep rate of 1% in the indicated time at the indicated temperature.
| Time | Temperature oC | 550 | 600 | 650 | 700 | 800 |
| 10 000 h | Stress MPa | 180 | 100 | 70 | 40 | 10 |
| 100 000 h | Stress MPa | 120 | 80 | 50 | 25 | 5 |
Creep Rupture Stress
| Time | Temperature oC | 500 | 600 | 650 | 700 | 800 |
| 1 000 h | Stress MPa | 270 | 180 | 140 | 70 | 30 |
| 10 000 h | Stress MPa | 240 | 130 | 90 | 50 | 10 |
| 100 000 h | Stress MPa | 200 | 90 | 50 | 15 | 5 |
Recommended Maximum Service Temperature
(Oxidising Conditions)
Continuous Service 950oC
Intermittent Service 870oC
Thermal Processing
1. Annealing Heat from 1050 to 1150oC and cool in air. This ensures maximum ductility of the steel.
2. Stress Relieving SX 321 can be stress-relief annealed within the sensitization temperature range
450-800oC without carbide precipitation occurring, thus avoiding the possibility of intergranular corrosion.
3. Hot working
Initial forging and pressing temperature: 1150 - 1250oC
Finishing temperature: 950oC
Note: Soaking times to ensure uniformity of temperature are up to 12 times that required for carbon steel. Care must be exercised with this grade, and long soaking times to ensure even distribution of carbides should be employed. The initial reductions must be light to allow dispersion of carbides in the flow pattern during forging.
Special Steel classification：
Stainless steel，Hi-Steel HSLA-80，Steel mould,Heat resistant steel,Tool steel,Ball bearing steel,Spring steel,Alloy steel,Construction steel，Die steel，Mould steel.
Product description：
Step Shaft 321 Tube 321 Pie-shaped 321 Ring 321 Module 321 Large valves of the main 321 Other Profiled forgings 321
Products Introduction :
Specialized and high quality steel.
We have the advantages of equipment, technologies and price.
Specifications
Round bar ：
Diameter : 1mm-2000mm
Square bar:
Size： 50mm * 50mm-600mm *600mm
Plate steel/flat bar:
Size：Thickness:0.1mm-800mm Width:10mm to 1500mm
Tube/pipe:
Size：OD:6-219mm WT：1-35 mm.
Cold-rolled sheet:Thickness:2-5mm Width:1000mm Length:2000mm
Hot-rolled sheet:Thickness:6-80mm Width:210-610mm
Length: We can supply any length based on the customer's requirement.
Forging/hot rolling/ extrusion of steel.
Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes
Finished goods condition: hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any conditions based on the customer's requirement
Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement
Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.
Ultrasonic inspection: 100% ultrasonic inspection for any inperfections or based on the customer's requirement
Excellent service for all kinds of industries,with advantages of technologies, equipment and price.
We serve you with our honesty, integrity, and professionality.
