High Quality Aisi Precision Bright Seamless Steel Pipe, 4140 Precision Bright Seamless Steel Pipe, Seamless Steel Tube Precision Bright Suppliers in China

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Precision Bright Seamless Steel Pipe Pipe Tube 140mm

  • Precision Bright Seamless Steel Pipe Pipe Tube 140mm
  • Precision Bright Seamless Steel Pipe Pipe Tube 140mm
  • Precision Bright Seamless Steel Pipe Pipe Tube 140mm
  • Precision Bright Seamless Steel Pipe Pipe Tube 140mm

Precision Bright Seamless Steel Pipe Pipe Tube 140mm

    Unit Price: 600~800 USD
    Min. Order: 1 Ton
    Packaging: Standard Export Packaging Or According to Customer Requirements
    Productivity: 10000 tons per month
    Brand: JianLong
    Transportation: Ocean,Land,Air,Express
    Place of Origin: Shandong China
    Supply Ability: 3000 tons per month
    Certificate: ISO
    HS Code: 730419
    Port: Tianjin Port,Qingdao Port,Shanghai Port

Basic Info

Model No.: Precision Bright Seamless Steel Pipe

Product Description

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


Precision Bright Seamless Steel Pipe

Outer Diameter


Wall Thickness


Material Grade

20# 45# Q345B Q345D 25Mn 27SiMn E355


ISO9001 2008




ASTM, ASME, A/SA 192, 209, 210 and 213 specifications and all associated grades. EN 10216, DN 17175,BS 3059, JIS 3461 – 3462


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


Widely used in hydraylic and pneumatic cylinder for automobile, engineering machinery, textile machinery, etc.

Delivery Condition


Delivery Time

Within 20-30 days after receiving downpayment or as client’s request

Trade Terms

FOB Yantai, Qingdao, or as client’s request

Product Display

steels (1)steel (2)

Packaging And Transportation



1.Why you choose us ?

Our company has been 12 years. We control the quality of the products very strictly, there are special people for the quality.

If you got lower price from other supplier ,we will pay back twice to customers about the higher price.

2.How long is your delivery time?

According to the quantity.Generally within 2-7 days if in stock.And 15-20 days if not in stock.

3.What is your payment terms?

A: By T/T 30% in advance ,and 70% before delivery.

B:100% L/C at sight.

C:By T/T 30% in advance,and 70% L/C at sight.

4.Do you provide samples ? Is it free?

Yes, we offer the sample for free but do not pay for the cost of freight.

5.What if the customer is not satisfied?

If there is a problem with the product,we take full responsibility.

If there is a problem in the transportation process,we will help you to solve it.

Shandong Jianlong Steel Co.

 Shandong Jianlong Steel Co., Ltd. is located in Jinan, Shandong Province, China. Our sales range covers seamless steel pipe, galvanized steel pipe, carbon steel plate, and Other steel products. We have established a perfect scientific management and quality assurance system. We are committed to continuously improve our product quality and service level to serve more customers and make Jianlong your preferred steel procurement supplier. Jianlong has a professional and efficient international trade team, which can better serve our customers. We insist on striving to be the world's first-class steel pipe manufacturer as our goal, and keep forging ahead, winning the recognition and support of many famous foreign enterprises, our service: 24 hours a day, all year round

Company Info

  • Company Name: Shandong Jianlong Steel Co.
  • Representative: LI CAI YUN
  • Product/Service: Seamless Steel Pipe , Galvanized Steel Sheets , Carbon Steel Sheet , Galvanized Steel Coil , Seamless Steel Tube , Stainless Steel Plate
  • Capital (Million US $): 5000000
  • Year Established: 2022
  • Total Annual Sales Volume (Million US $): Above US$100 Million
  • Export Percentage: 1% - 10%
  • Total Annual Purchase Volume (Million US $): US$50 Million - US$100 Million
  • No. of Production Lines: 20
  • No. of R&D Staff: 5 -10 People
  • No. of QC Staff: 21 -30 People
  • OEM Services Provided: yes
  • Factory Size (Sq.meters): 10,000-30,000 square meters
  • Factory Location: 山东省聊城市开发区广平乡大曲村
  • Contact Person: Ms. li cai yun
  • Tel: 86--15224342533
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