Stainless steel pipe cap
Beijing Metleader pipeline technology INC. specializes in manufacturing, trading and supplying a comprehensive range of Stainless Steel Pipe Cap which is precision engineered with the assistance of modern technologies. This steel cap is manufactured using the finest grade raw material and sophisticated techniques.
Splice weld direction when asked to only allow is radial and ring.After large cap may cancel this request.Stitching distance requirements, for more than 3 g, and not less than 100 mm (welding heat affected zone is high stress zone, and in the chemical composition of the area will be a loss.
So to avoid the high stress area, the area and thickness. According to the practical experience, the stress attenuation length is greater than 3 g, and not less than 100 mm).But refrigeration equipment is difficult to meet the requirements, has its particularity.
steel pipe cap specification and type:
Pipe cap including convex cap, conical shell, variable diameter section, the design of the flat cover and tighten.
Convex tube caps include: hemispherical tube cap, oval tube caps, disc pipe cap and QiuGuanXing cap.From the standpoint of stress, convex cap in the gradually from hemispherical tube cap is not good, but look from the manufacturing difficulty, good manufacture gradually.
stainless steel: 304 316 316 l, 321, 2520, 310, 316, such as material.
Size: DN15-48 "
Wall thickness: SCH5 - SCH160
Standard: ASME DIN JIS BS GB/T, JB SH HG
Useing: water, beverages, beer, food, petrochemical, nuclear power, chemical fertilizer, shipbuilding, machinery, medical equipment, waterproof processing, pipeline, etc
Packing: packed in wooden cases, cartons
service: provide technical advice, installation guide, etc
Purpose: welding on the pipe end or installed outside the pipe thread to cover wall Pipe Fittings.Close to line, the same as the plug.
how to test the butt welds pipe cap?
The butt welds joining together after forming the pipe cap, should be 100% rays or ultrasonic testing, the qualified level with the equipment shell.Finally forming the same welding seam detection level, scale and equipment shell, high waste.
Example: if the shell is 20% testing equipment, qualified III.The straight stitching and final weld, qualify, welded joint coefficient is 0.85;
If the equipment shell is 100% inspection, II qualification.The straight stitching and final weld is unqualified, II welding joint coefficient is 1 gread.
So straight stitching, although 100% inspection, qualified level, along with the housing.
But must pay attention to the process manufacturing process:
The correct way is: blanking (line) - small plate together into a big board - molding - nondestructive testing
If it's wrong to do testing before molding, can't guarantee is qualified after forming.That is nondestructive testing refers to the nondestructive testing.
Stainless steel pipe cap manufacturing process:
There is an inappropriate place in the production of carbon steel. Mainly due to work hardening, the deformation during stamping causes the stainless steel to deform martensite and produce magnetism. Every explanation is actually very reasonable.
This phenomenon is affected by factors such as cooling rate, material composition and heat treatment process. The faster the cooling rate, the higher the carbon content and alloy composition, the greater the uneven plastic deformation caused by thermal stress during cooling, and the greater the residual stress formed.
On the other hand, in the process of heat treatment, when steel changes to austenite to martensite, the increase of specific volume is accompanied by the expansion of the volume of the workpiece and the parts of the workpiece are successively transformed, resulting in inconsistent volume growth and tissue formation. stress.
The final result of the structural stress change of the stainless steel head is that the surface layer is subjected to tensile stress and the core is subjected to compressive stress, which is exactly opposite to the thermal stress. The magnitude of the tissue stress is related to the cooling rate, shape, and chemical composition of the workpiece in the martensitic transformation zone.
