... :Q235,45#,4Cr Rail fastener high strength structural steel nut bolt I. Item:High strength bolts for steel structuresII. Specification: DIN 6914, ... Usage:Supply to railway, highway, bridge, boiler with steel structure, industry workshop, high civil buildings, hoisting machinery and so on.IV. ... 2.From 2006, we have manufactured the products of high speed railway and now they are being used. We exported ...