Description
X07CR18NI9 Round Bars
X07CR18NI9 Round Bars is the most readily machineable of all the austenitic grades of stainless steel.
The machineable nature of Grade X07Cr18Ni9 Stainless Steel is due to the presence of Sulphur in the steels composition. Whilst the Sulphur improves machining, it also causes a decrease in the corrosion resistance and a slight lowering of the toughness. The corrosion resistance of grade X07CR18NI9 stainless steel is lower than that for 304. The toughness is still excellent as with other austenitic grades.
It comes under Indian Standard IS 6603 (2001) X07Cr18Ni9.
We M/s Textron Steel & Alloys are major stockist of X07CR18NI9 Round Bars in Bright & Black in shape of Round & Hex. For any inquiry please contact us.
Supplied Forms :
X07CR18NI9 Stainless Steel is typically supplied by us in the following forms:
- • Round Bars
- • Hexagonal Bars
X07CR18NI9 Chemical Composition :
| Element | Min. | Max. |
| C | – | 0.15 |
| Si | – | 1.00 |
| Mn | – | 2.00 |
| Ni | 8.00 | 10.00 |
| Cr | 17.00 | 19.00 |
| S | – | 0.030 |
| P | – | 0.045 |
Corrosion Resistance of Stainless Steel X07Cr18Ni9 Round Bars :
Sulphur additions to the composition act as initiation sites for pitting corrosion. This decreases the corrosion resistance of grade X07Cr18Ni9 Stainless Steel to less than that for 304. However corrosion resistance remains good in mild environments.
In chloride containing environments over 60°C, grade X07Cr18Ni9 Stainless steel is subject to pitting and crevice corrosion. Grade X07Cr18Ni9 stainless is not suitable for use in marine environments.
Heat Resistance of Stainless Steel X07Cr18Ni9 :
IS X07Cr18Ni9 Stainless Steel has good resistance to oxidation when intermittently exposed to temperature up to 760°C temperatures. It also has good oxidation resistance in continuous service to 870°C. This, however, is not recommended as X07Cr18Ni9 is sensitive to carbide precipitation with continuous use at 425-860°C.
Fabrication of Stainless Steel X07Cr18Ni9 :
Fabrication of all stainless steels should be done only with tools dedicated to stainless steel materials. Tooling and work surfaces must be thoroughly cleaned before use. These precautions are necessary to avoid cross contamination of stainless steel by easily corroded metals that may discolour the surface of the fabricated product.
Cold Working of Stainless Steel X07Cr18Ni9 :
X07Cr18Ni9 is not readily cold workable. Some cold working is possible but sharp bending should not be attempted.
Hot Working of Stainless Steel X07Cr18Ni9 :
Fabrication methods, like forging, that involve hot working like should occur after uniform heating to 1149-1260°C. The fabricated components should then be rapidly cooled to ensure maximum corrosion resistance.
Heat Treatment of Stainless Steel IS X07Cr18Ni9 :
X07Cr18Ni9 stainless steel cannot be hardened by heat treatment.
Solution treatment or annealing can be done by rapid cooling after heating to 1010-1120°C.
Machinability :
X07Cr18Ni9 stainless steel has excellent machinability. Machining can be enhanced by adhering to the following rules:
- • Cutting edges must be kept sharp. Dull edges cause excess work hardening.
- • Cuts should be light but deep enough to prevent work hardening by riding on the surface of the material.
- • Chip breakers should be employed to assist in ensuring swarf remains clear of the work
- • Low thermal conductivity of austenitic alloys results in heat concentrating at the cutting edges. This means coolants and lubricants are necessary and must be used in large quantities.
Welding of Stainless Steel X07Cr18Ni9
The sulphur addition present in Grade X07Cr18Ni9 stainless steel results in poor weldability. If Grade X07Cr18Ni9 stainless steel must be welded the recommended filler rods or electrodes are grades 308L and 309 stainless steels. For maximum corrosion resistance, the welds must be annealed.
Applications of Stainless Steel X07Cr18Ni9 :
X07Cr18Ni9 stainless steel is used in applications that require parts to be heavily machined. These applications include:
- • Nuts & bolts
• Screws
• Gears
• Aircraft fittings
• Bushings
• Shafts - • Springs
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