Prevention of horizontal cracking measures

- Oct 29, 2018-

1. Improve the quality of billet heating

(1) Strictly heat according to the process requirements, and use the upper limit temperature to heat, to prevent low temperature heating. For example, the heating temperature of carbon steel (1胪~45.) billet is 20~30°C higher than the original process, and the effect is better. According to statistics, the gap in the next five months fell by nearly 40%.

(2) For the inclined bottom furnace, the material should be diligently placed to make the billet heat evenly, and the appearance of the yin and yang surface is eliminated. At the same time, after the material is finished, the furnace door is closed to reduce heat loss.

(3) Strictly control the rolling rhythm to ensure that the billet is heated and penetrated without blackening. Avoid the phenomenon of perforated black spirals.

(4) Use high quality heavy oil to ensure the heating quality of the billet.


2. Improve capillary wall thickness accuracy

(1) Correctly adjust the perforation and rolling process parameters, improve the precision of the work rolls such as rolls, and make the blanks and waste pipes deform evenly during the piercing and rolling process.

(2) Accurately adjust the centering position and install a roller device so that the head can be aligned with the center of the blank to avoid eccentricity of the hole.

(3) Install and adjust the holding roller, hold the ejector pin tightly to prevent the ejector from sinking.

(4) Carry out the equipment repair system to keep the equipment in good condition and ensure the wall thickness accuracy of the capillary tube.

(5) Strengthen management, often measure the wall thickness of the capillary tube, and find problems in time to adjust.


Cangzhou Steel Pipe Group (CSPG) Co., Ltd

Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.



Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects



Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555

 

Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners