Stainless Steel Hollow Bar and Mechanical Tubing
Walmi is a manufacturer of stainless steel hollow bar and mechanical tubing as per ASTM A511, including an extensive material of austenitic stainless steel 304/304L,316/316L etc, duplex stainless steel S31803/S32205, super duplex stainless steel S32750 and high-alloy austenitic stainless steel 904L/UNS N08904.Stainless steel hollow bars and mechanical tubing are improved in processability without compromising corrosion resistance and mechanical strength.Corrosion test according to ASTM G-48 A,NACE MR 0175 / ISO 15156.
Sizes range from 32mm-1.26inch to 420 mm-16.54inch outside diameter with inside diameter ranging from 16mm-0.63inch to 300mm-11.81inch.
The stainless steel hollow bar and mechanical tubing are usually delivered in 4.0m-8.0m random lengths or cut to fixed lengths. But Walmi can supply cutting service for stainless steel hollow bar and mechanical tubing, cutting components are available as per customer’s exact requirements.
Stainless Steel Hollow Bar
Cutting Service
Stainless Steel Mechanical Tubing
Stainless Steel Hollow Bar-Component
HOLLOW BAR GRADES
304/304L 316/316L to ASTM A511
Other grades are available
HOLLOW BAR CHEMICAL
Normal Chemical Composition
to ASTM A511 A312
HOLLOW BAR SIZES
Standard hollow bar sizes
Finished part size / chucked true values
Walmi stainless steel hollow bar compliance to standards below:
ASTM A511
ASTM A479
ASME SA-479
NACE MR0175/MR0103
EN 10216-5
EN 10297-2
EN 10294-2
JIS G3446
MTC: EN10204:2004 3.1
HOLLOW BAR GRADES
304/304L 316/316L to ASTM A511
Other grades are available
HOLLOW BAR CHEMICAL
Normal Chemical Composition
to ASTM A511 A312
HOLLOW BAR SIZES
Standard hollow bar sizes
Finished part size / chucked true values
DELIVERY CONDITION
Cold Drawing/Rolling, Seamless
Solution Heat Treat & Water Quench
PRODUCTION PROCESS
Round Bar > Pipe blank > Cold Drawing
> NDT Testing > Mechanical Testing
TOLERANCE
General Requirements:
O.D. +2/-0%, with a minimum of +1/-0 mm (+0.04/-0”) for 275mm below OD
+/-1% for 275 mm and above OD (10.827’’)
I.D. +0/-2%, with a minimum +0/-1 mm (+0/-0.04″).
Straightness deviation: max. 1.5 mm per 1000 mm (0.059 inch per 3 feet).
Lengths: Random length. Fixed lengths are available if required.
* Tolerance according to ASTM A511 standard can be offered if required.
MECHANICAL PROPERTIES
Intergranular corrosion test according
to ASTM A262 Pratic E.
Walmi stainless steel hollow bars are all of the highest standard and will exceed all standard requirements without a shadow of a doubt.
Walmi Stainless Steel Hollow Bar are used extensively in the industries of Chemical, Petrochemical, Power, Automotive, Marine, Subsea, Offshore, Manufacturing, Pulp and Paper Processing, Food and Beverage processing, Dairy, Dying Industry, Architectural, Textile, Transport Industry, Hardware and Kitchenware Industry and many more.
The stainless hollow bar applications in the specific products can be found in the following:
Valves and actuators
Flow meters / Valves / Strainers / Baskets /
Samplers Pumps and compressors
Vacuum equipment / Hydraulic cylinders / Pump bodies Compression bodies
Axles and shafts
Rollers / Guides / Bushes / Shafts / Collars / Hubs / Bearings
Mechanical seals
Seals / Spacers / Rings
Connection assembly
Fittings / Flanges / Couplings / Connectors
Instrumentation
Sensors / Solenoids / Resistors
Agitation
Stirres / Agitators / Mixers / Blenders / Bottle filling machinery Refridgerators / Butchering / Mincers
Others
Wind mills / Watches
Walmi stainless steel hollow bar is delivered in 2.5m to 6.5m random lengths depending on sizes and grades. Lengths down to 1 m may be included in the delivery.
However, cutting services are available, the stainless hollow bar can be cut to fixed lengths if required. Walmi is committed to improving production economy for you as our customer in the machining industry.
♦ Cutting
♦ Deburring
Walmi stainless steel hollow bar is primarily used for the manufacture of radially machined components, a great variety of hollow products and cylindrical components, which will be used in conditions where corrosion is an issue .The use of hollow bar is an economic and efficient means of supplying high quality raw material and a sensible alternative to the use of solid bar as it reduces machining requirements and minimizes material wastage.
The advantages of stainless steel hollow bar can be found below:
♦ Excellent availability, Reduced customer inventories.
♦ No minimum order, 1 piece stainless steel hollow bar order is accepted by Walmi Stainless Steel.
♦ Improved cutting speeds and feed rates, better machine utilization and reduced fixed cost per produced stainless steel component.
♦ Reduced tool wear, lower lubricant usage and machinery maintenance costs, better machine utilization through reduced stoppage time.
♦ Less machine setting-up time and and machine cycle times, lower labor and overhead costs for each stainless component.
♦ Faster machining, shorter production time due to excellent and consistent machining properties of stainless steel.
♦ Easier handling due to lower weight per un-machined component of the hollow bar.
♦ Very competitive from short to long series production of hollow bar compared to forging.
♦ Shorter production time for hollow bar compared to bore out solid stainless steel bar.
♦ Tangled chips can be avoided Due to limited internal machining
