JIS G3474-1995 Designation and chemical composition of high-strength steel pipes for iron towers

JIS G3474-1995 High Strength Steel Pipe for Tower

High Strength Steel Pipe for Tower (JIS G3474-1995) is a specification developed by the Japanese Industrial Standard (JIS) as a high performance steel material for tower applications. It was developed in response to increasing demand from engineers and telecommunications companies for improved performance and durability in tower applications.

The pipe specification is composed of thick-walled steel pipes with precision compatible circular or rectangular cross sections, fabricated at the specified dimensions. The pipes are formed cold or warm-rolled steel process, which can be rolled at one of three manufacturing diameters. Materials with higher strength and higher oxide thickness are also available. The pipes are furnished with the necessary fittings and fittings and protected with an effective coating system appropriate to the design and purpose of the construction.

The pipes used in this specification are made of high-strength carbon-bearing alloy steel and are able to meet the requirements of JIS G 3475-1995. The mechanical properties of this type of steel pipes include tensile strength not less than 500MPa, yield strength not less than 500MPa, elongation not less than 10%, and hardness not more than150HB.

Chemical composition requirements for the high-strength steel used in the specification are as follows: carbon content 0.20-0.50%, silicon content 0.15-0.50%, manganese content 0.90-1.50%, sulfur content 0.020 %, phosphorus content 0.035%, chromium content 0.30-1.20%, and nickel content 0.010-0.50%.

The pipes can be manufactured in a variety of different grades, including STK 55, STK 42, STK 60, STK 50, STK 41 and STK 69. Sizes of pipes used in the specification range from 24 mm up to 440 mm in outside diameter. Lengths of pipe range from 5m to 12m.

The pipes have excellent strength and durability, thanks to the carefully crafted formulas used in their manufacture and the high-strength materials used. This makes them ideal fortower applications, where high levels of strength and durability are essential. In addition, the pipes manufacturing processis designed to provide additional safety and protection for the construction.

JIS G3474-1995 High Strength Steel Pipe for Tower provides an excellent solution for engineers and telecommunications companies looking for a reliable and high-quality product to use in their tower applications. It is manufactured to exacting standards and is suitable for both individual and high-volume applications. Thanks to its superior strength and durability, the product is trusted by leading telecommunications companies around the world and is used extensively in construction projects worldwide.

JIS G3474-1995 specifies the steel grades and chemical composition for the production of high-strength steel tubes for use in towers. The standard contains four grades. STKM11A is a carbon steel used for external scaffolding and forming pipes with a minimum yield strength of 300N / mm², or about 39ksi. STKM13A is a low alloy medium carbon steel with a minimum yield strength of 300N / mm², or about 39ksi. Further, STKM13B has a chromium content of 0.30% and a maximum yield strength of 400N / mm², or about 58ksi. Lastly, STKM 16C has a chromium content of 1.00% and a maximum yield strength of 500N / mm², or about 72ksi.

The chemical composition of the four grades of steel is as follows. All steels contain a minimum of 0.25 percent carbon. For STKM11A, the maximum limits are 0.20 percent sulfur, 0.54 percent manganese and 0.55 percent silicon. For STKM13A, the maximum limits are 0.20 percent sulfur and 0.80 percent manganese. For STKM13B, the maximum limits are 0.20 percent sulfur, 1,20 percent manganese, 0.30 percent chromium and 0.50 percent silicon. Finally, for STKM16C, the maximum limits are 0.20 percent sulfur, 1.00 percent manganese, 1.00 percent chromium and 0.50 percent silicon.

The physical and mechanical properties of the four grades of steels are also given in JIS G3474-1995. All four grades have a minimum yield strength of 300N / mm², or about 39ksi, and an elongation of 20 percent. The maximum yield strengths of the four grades vary, with STKM11A being 300N / mm², STKM13A being 400N / mm², STKM13B being 500N / mm² and STKM16C being 600N / mm².

In summary, JIS G3474-1995 contains specifications and chemical compositions of four grades of high-strength steel tubes used in towers. The four grades are STKM11A, STKM13A, STKM13B and STKM16C. All four have a minimum yield strength of 300N / mm², or about 39ksi, and an elongation of 20 percent. Further, the maximum yield strengths of the four grades vary, with STKM11A being 300N / mm², STKM13A being 400N / mm², STKM13B being 500N / mm² and STKM16C being 600N / mm².