Steel is a strong material that is highly resistant to shaping at normal temperatures but
this resistance lessens considerably at higher temperatures. For that reason the billets,
blooms and slabs from the steelmaking process are shaped into basic products at carefully
controlled elevated temperatures.
The method that is most commonly used for shaping is to heat the steel to around 1,200°C in
a reheat furnace and roll the steel, squeezing it between sets of cylinders or rolls. Rolls
are arranged in pairs and housed in a 'stand'.
To change the shape of a material as strong as steel the rolls must exert forces measured in
thousands of tonnes, and must also draw the steel continuously through the rolls while
reducing the thickness. Two main classes of product are produced - flat products , sheets or
strips of uniform thickness, and long products - lengths of a particular cross section,
ranging from rectangular bars to double flange H sections. For flat products, two horizontal
rolls are set one above the other in an open housing. For long products a series of
specially shaped and angled rolls (referred to as stands) are used to transform the section
to the required shape.
Stainless steel is the name given to a family of corrosion and heat resistant steels
containing a minimum of 10.5% chromium. There is a wide range of stainless steels with
varying levels of corrosion resistance and strength, as a result of controlled alloying
element additions. To achieve the optimal economic benefit, it is important to select a
stainless steel which is adequate for the application without being unnecessarily highly
alloyed, and hence costly.
The corrosion protection of stainless steel
Stainless steels are suitable for structural applications requiring long life, good
corrosion resistance and/or a high-quality surface finish. Austenitic stainless steels are
generally selected for structural applications which require a combination of corrosion
resistance, formability and excellent field and shop weldability. Where higher strength is
required, then duplex stainless steels are most suitable as cost savings are often possible
through use of thinner sections.
Sinorock stainless steel hollow bar is an alloy steel rock bolt which can resist corrosion in air or chemical corrosion conditions. The application of stainless self drilling rock bolt is as following:
Stainless hollow bar is applied to marine environment and chloride corrosion conditions.
It is also used for chemical industry and infrastructures if important equipment which requires high anti-corrosion quality.
It is widely used in bay, pier, pile foundation, breakwater and mooring system.
Stainless hollow bar meets the demands of anti-corrosion and seismic resistance, which can reach 120 years without maintenance.