A brief introduction of stainless steel pipe welding related knowledge

Stainless steel pipe parts as usual with carbon steel similar to the vertical, vertical bending or arc caster.The billet solidified with standard quality surface layer of welded stainless steel pipe fittings and high pressure flanges is continuously and rapidly cooled through the secondary cooling section until the billet becomes solid and then goes through fixed scale flame cutting, thus completing the whole continuous casting process.Stainless steel pipe from casting ingots into casting billet process.And because of the completion of continuous casting process quality control, now has become the need to advance the quality of products.Stain-less steel continuous casting billet products case quantity advantage convergence performance in not in addition to the first paragraph billet profile of the grinding rate has reached more than 70%, the dongguan all non-standard copper joint to implement this policy for molten steel needed to introduce fine stainless steel pipe welding knowledge, realizes the low oxygen and sulfur content, cut custom withhold type connector is abstemious molten steel temperature, pouring without oxidation, further reduce the content of photosynthate.

Stainless steel materials can be used in the present medical implant body health materials.Taizhou non-standard PU pipe through decades of development, has been widely used in food processing pipeline, beverage, dairy, brewing, pharmaceutical property and many other industries;In particular, it is widely used in medical implants for the safety and health of materials.Such as: medical often used in human body steel stent, human body steel nail, artificial bone, artificial teeth, etc.Of all the different delivery tubes we see today, only stainless steel is a truly healthy material and the only one medically available for implantation.

Each batch of welded stainless steel fittings shall consist of stainless steel fittings of the same trademark (steel grade) and the same specification.High quality steel and high quality steel in GB/ t699-1999 and GB/ t3077-1999 standards, the agreed system of "A" on the back of the standard of the buckle joint, for high quality steel, vice versa.High quality steel not only listed departments or all superior to high quality steel: reduce the size of the content of the status;Elimination of harmful elements (such as sulfur, phosphorus, copper) content;Guarantee higher purity (require less content of non-metallic homologues);Ensure higher mechanical function and process function.Vertical and horizontal standards in the vertical refers to the processing of the target parallel (that is, shun processing target);Horizontal is to point to with machining mark perpendicular (machining mark mark namely stainless steel tube is axial).

Stain-less steel continuous casting billet products case quantity advantage convergence performance in not in addition to the first paragraph billet profile of the grinding rate has reached more than 70%, shenzhen non-standard plastic joint to implement this policy must be to refining of molten steel, low oxygen and sulfur content, precisely control the molten steel temperature, pouring without oxidation, further reduce the content of photosynthate.Stainless steel pipe from casting ingots into casting billet process.And because of the completion of continuous casting process quality control, now has become the need to advance the quality of products.The refined molten steel is poured into the ladle.The ladle to be poured is transferred to the top of the inlet of the center ladle through the rotary table, and then the molten steel is injected into the center ladle through the long nozzle.The molten steel in the center ladle passes through the immersion nozzle into the crystallizer to form and condense and moves down continuously.

Weldability means that the same or different metal materials can be welded into the specific design of the appropriate structure under the manufacturing conditions, and meet the expected performance.Therefore, weldability should include customized hydraulic transition joint including two aspects of significance: first, bonding, that is, a certain metal material in the specified welding process conditions, the sensitivity to welding defects, that is, process weldability;Second, the use of performance, is the metal material in the specified welding conditions formed by the welding joint applicable to the use of conditions, also known as the use of weldability.Excellent weldability is a problem of welding metallurgy, which indicates that the base material and welding material can combine with each other without producing harmful components or phases, and can form compact weld metal instead of cracks, pores and other defects.

The excellent weldability is not only related to the metallurgical properties of the weld, but also related to the change of the microstructure and properties of the base material during the welding process.It is a heat treatment process for the heat affected zone of the base metal.The weldability and the use of weldability is not necessarily consistent, good weldability does not mean that the use of good performance, and vice versa.For the same brand of steel, its weldability is not invariable, with the improvement of the purity of steel, the improvement of welding materials, or the new development of welding methods, the original poor weldability of the material, can become better weldability of the material.For example, 1Cr18Ni9 austenitic stainless steel, due to its early C, S, P and other impurities high, often occur during welding thermal cracks.High C content makes intercrystalline corrosion difficult to avoid.In the past 30 years, the content of impurities and carbon in 304, 304L steel refined by VOD, AOD and other furnaces has been strictly controlled, which greatly reduces the tendency of weld metal to crack, improves the corrosion resistance of welded joints, and significantly improves the weldability of this kind of steel.