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G3445 Carbon steel tubes for machine structural purposes
Standard:G3445
Grade:STKM11A,STKM12A,STKM12B,STKM12C,STKM13A,STKM13BSTKM13C,STKM14A,STKM14B,STKM14C,STKM15A,STKM15C,STKM16A,STKM16C,STKM17A,STKM17C,STKM18A,STKM18C,STKM19A,STKM19C,STKM20A.
Length:5-12m random or be fixed as customers’ requests.
Application:Boiler, electricity, mechanical, gas cylinder, chemical, offshore and oil service
Surface Finish:Anti-corrosion and high-temperature resistant with black painting Packing:Bundles, seaworthy wooden cases.
With or without end caps, varnish or as per clients requirements.
1.Scope
This Japanese Industrial Standard specifies the carbon steel tubes, hereinafter referred to as the "tubes", used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.
Remark
1. The units and numerical values given in {} in this Standard are based on the International System of Units (SI) and are appended for informative reference.
2. Further, the traditional units accompanied by numerical values in this Standard shall be converted to the SI units and numerical values on January 1. 1991.
2. Grade and Designation
The grade and designation of the tube shall be as given in Table 1.
The subclassification letter symbols A, B and C are used to indicate distinction of method of manufacturing the tube, cold working process, heat treatment, etc.
3.Chemical Composition
4. Mechanical Properties
4.1 Tensile Strength, Yield Point or Proof Stress, and Elongation
The tube shall be tested in accordance with 8.2 and the resulting tensile strength, yield point or proof stress, and elongation shall comply with Table 3
4.2 Bending Strength or Flattening Strength
The tube shall be tested in accordance with 8.3 or 8.4 and shall be free from flaws or cracks on their wall surfaces.
The bending test, however, shall be applied to the tubes 50 mm or under in outside diameter in lieu of flattening test when especially specified by the purchaser.
