ASTM 106 GB20 Tubo de acero sin costuras de carbono

Descripción del Producto

The precision bright tube is quenched to obtain martensite structure, and then tempered at 450~600 ℃; Or after tempering at 650 ℃, it passes through 350~600 ℃ at a slow cooling rate; Or after tempering at 650 ℃ and heating for a long time at 350~650 ℃, the precision bright tube will be embrittled. If the embrittled 20 # precision steel tube is reheated to 650 ℃ and then quickly cooled, the toughness can be restored, so it is also called% 26ldquo; Reversible tempering brittleness% 26rdquo; The high temperature tempering brittleness is shown by the increase of the transition temperature from toughness to brittleness of precision bright tubes. High temperature tempering brittleness. The sensitivity is generally expressed by the difference between the ductile brittle transition temperature (% 26Delta; T) of the ductile state and the brittle state. The higher the brittleness of high temperature tempering, the higher the proportion of intergranular fracture on the fracture surface of precision bright tube.

The role of elements in precision bright tubes on high temperature tempering brittleness can be divided into: (1) Impurities such as phosphorus, tin, antimony, etc. that cause high temperature tempering brittleness of precision bright tubes. (2) Alloying elements that promote or slow down high temperature tempering brittleness in different forms and degrees. Chromium, manganese, nickel and silicon play a promoting role, while molybdenum, tungsten and titanium play a delaying role. Carbon also plays a catalytic role. General carbon precision bright tube is not brittle to high temperature tempering. It is sensitive. Binary or multicomponent alloy steels containing chromium, manganese, nickel and silicon are very sensitive, and their sensitivity depends on the type and content of alloy elements.

The sensitivity of the original structure of the tempered precision bright tube to the high temperature tempering brittleness of the steel is significantly different. The martensite high temperature tempering structure is most

Cold rolled (dialed) seamless steel pipes include general steel pipes, low and medium pressure boiler pipes, high pressure boiler pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes and other steel pipes. They also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes and profiled steel pipes. The outer diameter of hot-rolled seamless pipe is generally larger than 32 mm, the wall thickness is 2.5-75 mm, the outer diameter of cold-rolled seamless pipe can reach 6 mm, the wall thickness can reach 0.25 mm, the outer diameter of thin-walled pipe can reach 5 mm, the wall thickness is less than 0.25 mm, and the dimension precision of cold-rolled seamless pipe is higher than that of hot-rolled pipe.

Precision annealing refers to the technology of cold drawn precision steel tubes and precision bright steel tubes, which are annealed according to the customer's requirements for flexibility. Annealing is divided into open flame annealing and oxygen free annealing.
Open fire annealing is to burn the furnace body to the temperature of steel pipe from 800 to 1100 degrees, to achieve the softness required by customers.

Shandong Jianlong Iron and Steel Co., Ltd. es una compañía con más de 10 años de experiencia. Estamos ubicados en Liaocheng, una de las áreas productoras de acero más grandes de China. Tenemos nuestra propia planta de producción. También tratamos en la bobina de acero prepandada, la hoja de techos corrugados, etc. Bienvenido a la compra.

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Preguntas más frecuentes

1. ¿Por qué nos eliges?

Nuestra empresa ha pasado 12 años. Controlamos la calidad de los productos muy estrictamente, hay personas especiales para la calidad.

Si obtuvo un precio más bajo de otro proveedor, pagaremos dos veces a los clientes sobre el precio más alto.

2. ¿Cuánto tiempo es su tiempo de entrega?

De acuerdo con la cantidad. Generalmente dentro de 2-7 días si está en stock. Y 15-20 días si no está en stock.

3. ¿Cuáles son sus términos de pago?

R: T/T 30% de anticipación, y 70% antes del parto.

B: 100% L/C a la vista.

C: por T/T 30% de anticipación, y 70% L/C a la vista.

4. ¿Proporciona muestras? ¿Es gratis?

Sí, ofrecemos la muestra de forma gratuita, pero no pagamos el costo de la carga.

5. ¿Qué pasa si el cliente no está satisfecho?

Si hay un problema con el producto, asumimos toda la responsabilidad.

Si hay un problema en el proceso de transporte, lo ayudaremos a resolverlo.