Hemisphere/stainless steel bowl/basin sphere

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250mm 300mm Shiny Spinning Lathe Half Stainless Steel Ball/Steel Hemisphere

250mm 300mm Shiny Spinning Lathe Half Stainless Steel Ball/Steel Hemisphere

250mm 300mm Shiny Spinning Lathe Half Stainless Steel Ball/Steel Hemisphere

250mm 300mm Shiny Spinning Lathe Half Stainless Steel Ball/Steel Hemisphere



Q:What are your finish options?


A:Yes, we offer a wide range of options to meet different requirements from our clients regarding size/diameter, thickness, color and material and so on. Options include: stainless 304 and 316 or 201, powder coat, paint, galvanized plate, or natural rust finish. Our powder coated finish has an undercoated zinc plate for outdoor use, which also eliminates the need for maintenance and rusting. 



Q:What is your lead time?


A:Our general lead time is 10-15 days but may extend during peak periods.


Q: Is there any maintenance required?


A:304 steel is enduring indoors and should be kept from water. 316 is the best steel on the market with overwhelming capability against water-erosion. Long term exposure to the elements and environment will cause changes and a continuation of the rusting process. If this is not desired, we recommend a small degree of maintenance. 






Product Description

 Technique Applied

 Two discs were cut on a circle shear. Then they were taken to a spinning lathe where the disks were shaped against a hemispherical steel mold.



Obviously some of the design constraints and parameters were set by the parts I was re-using from the drill press. This did introduce some less than optimal limitations -- such as the use of 19mm bearings, meaning that the mains-shaft of the lathe was also limited to 19mm in diameter. If this turns out to be too weak I'll just go buy some bigger bearings and make a new shaft.


Other than the legacy components, there was the issue of exactly what I had sitting in my metal rack and scrap bin -- which wasn't much.


Apart from the main-shaft, just about everything on this lathe was made from 25mm square or 25x50mm CRS 1020 steel bar stock.


There are no castings -- it's just cut to size and bolted together.


The main spindle and the backplate were turned from 304 steel which is much nicer to work with than plain old 1020. The chips from 304 are small and blunt and -- unlike the razor sharp shards that come off 304 when it's milled or turned. If you're planning to turn anything out of steel, do yourself a favor and get some free-machining stock such as 201 or 304.




Physical capability of stainless steel balls







Tensile strength

100,000 - 180,000 psi

100,000-180,000 psi

100,000 - 180,000 psi

90,000 psi

Yield strength

50,000 - 150,000 psi

50,000-150,000 psi

50,000 - 150,000 psi

45,000 psi




55 - 60%


Modulus of Elasticity

29,000,000 psi

29,000,000 psi

29,000,000 psi

28,000,000 psi


280lbs/cubic inch

286lbs/cubic inch

286 lbs/cubic inch

290lbs/cubic inch 


AISI NumberC %Si %Mn %Cr %Ni %Mo %P %S %Character
AISI 3020.15 Max1.00 Max2.00 Max17.0~ 19.08.0~ 10.5 0.045 Max0.03 MaxSlightly magnetic Austinitic
AISI 3040.07 Max1.00 Max2.00 Max17.0~ 19.08.50~ 10.5 0.045 Max0.03 MaxSlightly magnetic Austinitic
AISI 3160.07 Max1.00 Max2.00 Max16.5~ 18.510.5~ 13.52000~ 2.500.045 Max0.03 MaxNon magnetic Austinitic Excellent corrosion resistance
AISI 420J0.17~ 0.251.00 Max1.00 Max12.0~ 14.0  0.045 Max0.03 Maxmagnetic Hardenable HRC 48 Min fair corrosion resistance
AISI 4300.08 max1.00 Max1.00 Max15.5~ 17.5  0.045 Max0.03 Maxfair- good corrosion resistance
AISI 440C0.95~ 1.201.00 Max1.00 Max16.0~ 18.0 0.40~ 0.800.04 Max0.02 Maxfair corrosion resistance Hardenable HRC 58 Min






Packaging & Shipping

 Corrugated carton, opp bag and foam




Production Procedures




This product is versatile and widely used in various fields. The lead time is at least 15-20 days or depending on quantity. The product has many excellent performance, suitable for a variety of applications. The lead time is at least 15-20 days or depending on quantity.
Well-known for manufacturing and supplying an extensive array of world-class Stainless Steel Products, Foshan Dongyuan limited started its operation in the year 2010. The offered product range consists of Hemisphere/stainless steel bowl/basin sphere and much more. The stainless steel, which is best in the market, is used for manufacturing of the offered stainless steel products and fittings. Our professionals precisely engineer the offered stainless steel products and fittings in fulfillment with international quality standards. Offered by us, these stainless steel products and fittings are extremely appreciated among our patrons for their rich features such as corrosion resistant, high tensile strength, robust design, flawless finish, and durability. Offered by us, these stainless steel products and fittings can be custom designed in adherence to the set industry standards and regulations. We have been able to cater a huge clientele across the domestic markets, owing to our ability to efficiently meet the bulk demands within the assured time frame. For the purpose of maintaining the best possible quality, we have set up a well-equipped in-house quality testing unit.
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