Steel, mild, tensile properties

Mechanical properties High tensile (HT) fasteners as in ISO 4014 and ISO 898, grade 8.6 Ordinary MS (mild steel) fasteners as in ISO 4016, grade 4.6... 

Physical Properties.—Cobalt is a silver-white metal which, when pure, may be machined in a lathe as readily as pure nickel or pure iron. The commercial metal, containing small percentages of carbon, machines after the manner of mild steel. When under corresponding conditions cobalt is harder than nickel and iron.9 The effect of carbon between 0-06 and 0-37 per cent, is not sufficient to counteract that of slight variations in the heat treatment. The tensile strength of cobalt when pure, cast, and unannealed is 34,400 lb. per square inch, which value is increased to 59,700 lb. with a carbon content of 0 062 per cent. and to 61,900 lb. when the carbon reaches 0-25 per cent. 

Tantalum is a relatively high-cost heavy metal with a density more than twice that of steel. The physical properties of tantalum are similar to mild steel, except that tantalum has a much higher melting point (3000°C). The tensile strength is about 345 MPa, which can be approximately doubled by cold work. Tantalum is easy to fabricate. It is soft, ductile, and malleable and can be worked into intricate forms. It can be welded by a number of techniques but requires completely inert conditions during welding. 

Fig. 8.47 Effect of strain rate on tensile properties of mild steel at room temperature (modified from [40])...

The company AMTROL-ALFA produced the liner from mild steel sheets by welding two deep-formed half parts. Due to hardening different properties were determined from tensile tests in samples cut from the steel liner dome and cylinder zones. Table 2 and Figure 1 show the properties determined from those tests and used in the FEM simulations. 

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