NEWS-Zhishang Steel

A Roller Shutter Is Balanced by Its Spring, Not by Its Motor2026-11-10

A 4 x 4 m shutter is 82 kg of 0.5 mm curtain and 60 Nm of spring torque, which is why the order starts with clear opening, cycle count and wind class rather tha···

The Roof Sheds 28 Litres a Second; the Gutter Has to Take It2026-11-10

A 1,000 m2 roof sheds 27.8 litres a second at 100 mm an hour, which is five outlets, not the two usually drawn. Sizing gutters and downpipes from rainfall inten···

Scaffolding Tube Is Bought Once and Counted Every Year2026-11-09

A 48.3 x 3.2 tube weighs 3.56 kg a metre and a 2.75 mm wall saves 13 per cent of it and 12 per cent of the stiffness. What the wall thickness buys, where Q195 s···

A Hand Picks the Rail; a Load Picks the Post2026-11-09

The rail is chosen by hand and the post by a 1 kN push at 1.1 m, which is why a 60 x 60 x 2 post deflects half as much as a 50 x 50 x 2 for 21 per cent more ste···

Nitric Acid Is the One Acid That Punishes Molybdenum2026-11-09

A nitrogen complex runs four different liquids across one site. Why ammonia is a carbon steel job with a cold clause, why nitric acid rewards 304L over 316L, an···

In a Dyehouse the Salt Is the Corrosion Problem2026-11-09

A dyehouse puts 400 to 640 kg of salt into an 8,000 litre batch six times a day. Why the salt, not the dye, decides the stainless order, and how a machine is zo···