During the manufacturing process of steel pipes, the grease grains used for lubrication will also be deformed due to processing. In order to avoid grease residue in the steel pipe, argon gas is used as the furnace atmosphere at high temperature during annealing. The argon gas is combined with carbon and oxygen on the surface of the steel pipe to burn, further cleaning the surface of the steel pipe to produce a bright surface effect. This method of heating and rapidly cooling the steel pipe with pure argon gas is called bright annealing. Although this method can ensure that the steel pipe is fully clean and free of any external pollution, the brightness of this surface will feel matte compared with other polishing methods such as mechanical, chemical, and electrolytic polishing. Of course, its effect is also related to the content of argon gas and the number of heating times.
Description
Material: 304,304L，316，316L，etc.
▶ Standard: ASTM A249, A269, A270, 3A and BPE standard, JIS G3447. G3459.
▶ Forming: mainly multi-roll cold rolling, dimensional accuracy can reach 0.2%, inner surface finish Ra< 0.45 um.
▶ Features: precise size, smooth surface, overall cleanliness, inner surface finish is better than polished finish.
▶ Raw materials: meet ASTM A269 standard, special requirements can use two furnace steel ingots.
▶ Manufacturing: cold rolling + fine drawing, dimensional accuracy reaches about 0.05mm, inner surface Ra is about 0.4 microns.
▶ Heat treatment: bright solution (annealing) under the protection of reducing atmosphere
▶ Cleaning: use SC2286 cleaning agent for ultrasonic cleaning, that is, degreasing and deoiling must be done.
▶ Inspection: Eddy current non-destructive testing + water pressure and other methods
▶ Finishing: straightening + sizing + polishing
▶ Packaging: inkjet printing + PE bag + cap + shock-absorbing packaging + dust-proof packaging + protective protection
▶ Application: special gas or liquid transportation, and also the base material of EP pipe.
▶ Applicable industries: biopharmaceuticals, electronic clean workshops, high-purity gases, high-demand clean laboratories, liquid crystal displays, solar photovoltaics, polysilicon and other fields, semiconductor industry, liquid crystal industry, pharmaceutical industry, instrumentation systems, compressed air, ultra-high purity gases, chemical systems, WFI systems and other gas pipeline systems or clean rooms or equipment with high purity and ultra-high purity requirements.
