TPT July 2011

CONTENTS

V OL 24 N O 4

J ULY /A UGUST 2011

94

106

Coating, Pickling and Galvanising

Cutting, Sawing & Saw Blades The sundering of a material whose molecular structure resists separation is a difficult exercise. The cutting operation on a high-speed tube mill – across a profile at once hard and light as air – is more challenging still, from its high requirement for accurate intervals and fine tolerances to the destructive potential of its detritus. The products and services reviewed in this section are offered by people whose dedication to the ideal of a clean-cut tube is such that they see hardly any daylight between cutting and end finishing.

The protective specialities reviewed here developed as a necessity of the making of steel, which is no sooner produced than it begins to rust. Coating, pickling and galvanising – essential to the tube and pipe industry from earliest times – only gained in importance as the products of that industry have grown in value. The rejection, on final inspection, of any made object hands the maker a loss. When the workpiece is a high-end tube that is extremely expensive to produce and needs to last a long time, such as those used in automobile manufacturing, the loss can be very steep.

92

102

13-15 September 2011

126 Innovation and development of roll for steel pipe and cold roll forming steel Yuan Houzhi, Liu Xingyi, Zhang Ning – Shandong Province Sifang Technical Development Co Ltd, China