steel Precision Bright

3 year ago

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Shandong Jianlong Special Steel Co., Ltd.

 3 year year

Product details

Product Description

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. is a company with more than 10 years of experience. We are located in Liaocheng, one of the largest steel producing areas in China. We have our own production plant. We also deal in prepainted steel coil, corrugated roofing sheet , etc. Welcome to purchase.

Product Specification

Name	Precision Bright Seamless Steel Pipe
Outer Diameter	30-250mm
Wall Thickness	2-30mm
Material Grade	20# 45# Q345B Q345D 25Mn 27SiMn E355
Certificate	ISO9001 2008
Standard	GB/T8713,GB/T3639,DIN2391,EN10305,ASTMA519
Technique	ASTM, ASME, A/SA 192, 209, 210 and 213 specifications and all associated grades. EN 10216, DN 17175,BS 3059, JIS 3461 – 3462
Package	1. bundle packing 2. marking as per customer's requests 3. paint on the pipe as per customer request 4. pipe caps as customer request
Application	Widely used in hydraylic and pneumatic cylinder for automobile, engineering machinery, textile machinery, etc.
Delivery Condition	BK/BKW/BKS/GBK/NBK
Delivery Time	Within 20-30 days after receiving downpayment or as client’s request
Trade Terms	FOB Yantai, Qingdao, or as client’s request