Product name

304 ( 0Cr18Ni9 ) of stainless steel seamless tube

Product introduction

[ a ] the production specifications ( mm ): White 6 x 1 to 830 x 20 ( can be customized according to customer requirements )

[ two ] finished length (m ): 5 - 7 ( can be customized according to customer requirements ), part of the long and up to 28m

[ three ] product material: 304 ( 0Cr18Ni9 )

[ four ] theoretical weight ( kg / M ): you you you you you Cr-Ni austenitic stainless steel you you you W = 0.02491S ( D-S )

[ five ] Executive standard:

GB: GB / T14975-2002 GB / T14976-2002 GB / T13296-2007 ASTM A312 / A312M ASTM American Standard: A269 / 269M ASTM A213 / 213A German standard: Standard: JIS G3463 DIN2462

Product characteristics

Chemical analysis:

Grade chemical composition ( mass fraction), %

C ( carbon ) Si ( silicon ) Mn (MN ) P ( P ) S ( sulfur ) Ni ( nickel ) Cr ( CR ) Mo ( MO) other

0Cr18Ni9 = 0.07 = 1 = 2 = 0.035 = 0.030 8 - 11 17 - 19 -

In 2, the hydraulic test:

On the seamless tube of stainless steel by root hydraulic pressure test, the set pressure value, maintain not less than 5 seconds. Steel pipe or water leakage or seepage, regular supply hydraulic pressure test for P = 2SR / D ( maximum 20MPa ). 3, corrosion resistance:

The intergranular corrosion resistance and excellent corrosion resistance to alkali solution, and most organic and inorganic acid also has a certain ability to resist corrosion for stainless steel seamless pipe, according to the standard or agreement corrosion method for corrosion inspection, there shall be no intergranular corrosion tendency. 4, process performance test:

Flattening test. Tensile test. The flaring test. Hardness test. Metallographic test. Nondestructive testing ( including eddy current inspection and ultrasonic inspection ).

Product use

For acid conveying pipeline, chemical equipment, heat exchanger pipe, and the other with water contact processing equipment, 304 stainless steel has been very successfully used in chlorine ion content is low in the water. In general, especially a gap appears, 304 stainless steel limit is 100ppm chloride. High content of chlorides may cause crevice corrosion and pitting corrosion. In more severe conditions, such as: low pH, or high temperature, it will consider the use of molybdenum content high stainless steel, such as 316. 304 in 427 C - 816 degrees C temperature, exposure to harsh environments, easy formation of intergranular corrosion. Boiler plant, heat exchanger plant, chemical plant, water treatment plant.