China Categories
Ss 303 Bright Steel Round Bar Stock Ground Finish 100% Ultrasonic Ok
Ask Latest Price
Brand Name:Mittel
Model Number:303
Certification:SGS ISO
Price:2.85 USD/KG
Payment Terms:L/C, T/T
Supply Ability:50000KGS
Delivery Time:7Days
Company Data
Verified Supplier
Contact Person
Gao Ben
Business Type:
Manufacturer Distributor/Wholesaler Agent Exporter Seller
Officials:
NO.288,YOUYI ROAD ,XI SHAN DISTRICT,WUXI CITY,CHINA
Quality:
Quality Certifitation Available
Visit Website
Product Details
Company Profile
Product Details
SS 303 BRIGHT ROUND BARS GROUND FINISH 100%ULTRASONIC OK 303 Stainless Steel Round Bar
Stainless Steel - Grade 303 (UNS S30300)
Grade 303 represents the optimum in machinability among the austenitic stainless steels. It is primarily used when production involves extensive machining in automatic screw machines. Machinability Rating (compared to B1212) is approximately 78%.
303 is also available as a "Ugima" Improved Machinability grade, with machinability even higher than that of the standard 303.
The sulphur addition which is responsible for the improved machining and galling characteristics of Grade 303 lowers its corrosion resistance to below that of Grade 304. As for other austenitic grades the structure gives 303 excellent toughness, although the sulphur in 303 reduces its toughness slightly.
Grade 303Se (UNS S30323) has a selenium rather than sulphur addition, improving the hot and cold forming characteristics over those of 303 and providing a smoother machined surface finish. The machinability rate is also slightly reduced. Grade 303Se is not readily available in china
Key Properties
These properties are specified for long product (bar) in ASTM A582. Similar but not necessarily identical properties are specified for other products such as wire and forgings in their respective specifications. Grade 303 is not produced in flat rolled products.
Composition
Typical compositional ranges for grade 303 stainless steels are given in table 1.
able 1. Composition ranges for 303 grade stainless steel
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Se | |
| 303 | min. max. | - 0.15 | - 2.00 | - 1.00 | - 0.20 | 0.15 - | 17.0 19.0 | - | 8.0 10.0 | - |
| 303Se | min. max. | - 0.15 | - 2.00 | - 1.00 | - 0.20 | 0.06 - | 17.0 19.0 | - | 8.0 10.0 | 0.15 min |
Mechanical Properties
Typical mechanical properties for grade 303 stainless steels are given in table 2.
Table 2. Mechanical properties of 303 grade stainless steel
| Grade | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness | |
| Rockwell B (HR B) | Brinell (HB) | ||||
| 303 | - | - | - | - | 262 max |
Physical Properties
Typical physical properties for annealed grade 303 stainless steels are given in table 3.
Table 3. Physical properties of 303 grade stainless steel in the annealed condition
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 303 | 8027 | 193 | 17.3 | 17.8 | 18.4 | 16.3 | 21.5 | 500 | 720 |
Grade Specification Comparison
Approximate grade comparisons for 303 stainless steels are given in table 4.
Table 4. Grade specifications for 303 grade stainless steel
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 303 | S30300 | 303S31 | 58M | 1.4305 | X8CrNiS18-9 | 2346 | SUS 303 |
| 303Se | S30323 | 303S42 | - | - | - | - | SUS 303Se |
| These comparisons are approximate only. The list is intended as a comparison of functionally similar materials notas a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted. | |||||||
Possible Alternative Grades
Possible alternative grades to grade 303 stainless steels are given in table 5.
Table 5. Possible alternative grades to 303 grade stainless steel
| Grade | Why it might be chosen instead of 303 |
| 304 | Better corrosion resistance, formability or weldability are needed, at the expense of lower machinability. |
| 316 | Higher resistance to pitting and crevice corrosion is required, in chloride environments. A lower machinability can be accepted. |
| 416 | Even higher machinability than 303 is needed, and a lower corrosion resistance can be tolerated. Or hardening by thermal treatment is required, while maintaining a high machinability. |
Corrosion Resistance
Good resistance to mildly corrosive atmospheres, but significantly less than Grade 304 due to the sulphur addition; the sulphide inclusions act as pit initiation sites. Grade 303 should not be exposed to marine or other similar environments, as these will result in rapid pitting corrosion. Because the sulphide inclusions in 303 are primarily aligned along the rolling direction the corrosion resistance is particularly reduced in cross-sections.
Grade 303, like other common austenitic stainless steels, is subject to stress corrosion cracking in chloride containing environments above about 60°C.
Heat Resistance
Good oxidation resistance in intermittent service to 760°C and in continuous service to 870°C. Continuous use in 425-860°C range not usually recommended due to carbide precipitation - 303 usually does not have a low carbon content so is susceptible to sensitisation.
Fabrication
As well as reducing the corrosion resistance, the sulphur additions in 303 also result in poor weldability and reduced formability compared to Grade 304. Sharp bends should not be
attempted in 303. A practical compromise alternative may be a 304 Ugima Improved Machinability grade - this does not machine as readily as 303, but does offer better formability (as well as better weldability and corrosion resistance).
Heat Treatment
Solution Treatment (Annealing) - Heat to 1010-1120°C and cool rapidly. This grade cannot be hardened by thermal treatment.
Welding
Not generally recommended but, if unavoidable and a lower strength can be tolerated, use Grade 308L or 309 electrodes. AS 1554.6 does not pre-qualify welding of 303. Welds must be annealed for maximum corrosion resistance.
Machining
A "Ugima" improved machinability version of grade 303 is available in round bar products. This machines significantly better even than standard 303, giving very high machining rates and lower tool wear in many operations.
Photo
Company Profile
JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
Jiangsu Mittel Steel Industrial Limited is located in Wuxi City, a beautiful city near Shanghai. Wuxi is close to Shanghai (BAO STEEL) ,Zhangjiagang (ZPSS),Ningbo (BAO XIN),KUN SHAN (DKSS), enjoy excellent geographic location and convenient water, land and air transportation. , Wuxi become the biggest stainless steel sheet ,plate and coil supply Centers in China. Jiangsu Mittel Steel Industrial Limited was established in 1998 years. as one of the largest stockists and manufacturers of industrial grade Stainless Steel products and derivatives in Wuxi ,We keep a stock of 50000 tons every month, so we can delivery goods in fast time.
Our company supplies cold/hot-rolled stainless steel
sheets,stainless steel coils and stainless steel Plate to many
steel factories from athome and abroad, including Shanxi Taigang
Iron& Steel CO, . Ltd (TISCO)Zhangjiagang Pohang (ZPSS),
Shanghai BAO STEEL, Ningbo Baoxin and steel factories in Taiwan
area, Mainland Chinese and foreign countries and regions.
Our long-term business lines are
201.202.304(1.4301).304L.316.316L(1.4404).430.409L, 309S
,310S(1.4845).317L.904L.S31803(1.4462).S32750.S32760, Finish: 2B,
BA, NO. 1 NO. 4, HL, 8K and so on...Meanwhile, our company is also
engaged in the long-term supply of homemade & imported medium
and thick plates, galvanized and carbon steel products.
Adhering to the principle of "quality first and customer
foremost",our company will offer long-term service to nationwide
manufacturers of household appliances, elevators, tableware,
ornaments, tanks and machines. We can offer precise frosted
wiredrawing, 8K mirror finishing and skim board oil-abrasion of
various specifications at any time. The precisely-processed
products will meet your requirements for high quality. Our company
is a modern enterprise integrating distribution and storage.
If you are interested in any of our products or would like to
discuss a custom order, please feel free to contact us. We are
looking forward to forming successful business relationships with
new clients around the world in the near future.
Send your message to this supplier
You May Like
Stainless Steel 304 Round bar,bright ,black finished 304 stainless steel Soild bar
Grade 304 316L Stainless Steel Round Bar
GB DIN polished stainless steel bar 201 304 304L 310S 316l cold drawn finished
400 series stainless steel rod stock 410 420 4 - 100mm OD size
High Carbon ASTM 420 Stainless Steel Bar 20Cr13 UNS42000 Forged Rod
316L Stainless Steel Round Bar TP316L Round Bar SUS316L Hollow Bar
Hot rolled 3mm stainless steel rod stock 310S 321 304 stainless steel rod
904l Stainless Steel Alloy Round Bar Cold Drawn / Hot Rolled / Forging Stainless Steel Rod Grade 904L
400 series stainless steel round bar , black , bright , polished 410 420 430 round bar
Bright , polished 630 stainless steel round bar SGS BV dia 10-250mm , 630 stainless bar stock
Super Duplex S32750 Round Stainless Steel Bar With Black Surface
Inquiry Cart
0