51 steel pipe network for everyone to introduce seamless boiler

The boiler seamless pipe is a type of boiler pipe and belongs to the category of seamless steel pipes. The manufacturing method is the same as that for seamless pipes, but there are strict requirements for the steel grades used in the manufacture of steel pipes. Boiler seamless pipes are often used under high temperature and high pressure conditions. The pipes are subject to oxidation and corrosion under the effect of high-temperature flue gas and water vapor. The steel pipe is required to have high endurance strength, high oxidation corrosion resistance, and good organization stability. The boiler seamless pipe is mainly used to manufacture high pressure and pipe, main steam pipe and so on.
Boiler seamless pipe adopts steel number:
(1) High-quality carbon structural steel grades are 20G, 20MnG, and 25MnG.
(2) Alloy structural steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.
(3) The rust-resistant heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb boiler tubes in addition to ensure chemical composition and mechanical properties, to do the hydrostatic pressure test by root, to be flaring, flattening test. The steel pipe is delivered in a heat-treated state.
In addition, there are certain requirements on the microstructure, grain size, and decarburization layer of the finished steel pipe.

High Speed self-Recovery Rapid doors are the technological evolution of old, PVC high speed doors or heavy folding doors, now obsolete and not suited to today's industrial needs. 

High-quality panels, the resistive safety edge fitted to the bottom edge of the door, photocells and barriers make this product both safe and durable, being totally self-repairing, thanks to its special [Anti Crash System". 

This door designed with a perimeter structure in galvanized or stainless steel, which is ideal for sliding panels. The door panel rides effortlessly within a track, thanks to the special profile and hinge designed by us, requiring low maintenance. The panel is rolled up on a roller placed within the upper crossbeam. 

The door can be equipped with a counterweight or ups batteries, to fully open the door in case of power failure, and can also be equipped with large transparent sections to create a brighter and safer working environment.

Self-Repairing Door Curtain made of reinforced PVC, with flexible weighted soft bottom edge. 

The edge of curtain has continuous injection molded teeth that then move up and down in a self-lubricating polyethylene track attached to structural galvanized side frames.

Self-Recovery Rapid Door

Self-Recovery Rapid Door,Self Recovery PVC Rapid Door,Self Recovery Rapid Rolling Door,Self Healing Roll Door

Shenzhen Hongfa Automatic Door Co., Ltd. , http://www.hongfadoor.com