China Made Cold Rolled Cold Drawn Seamless Bearing Steel Pipe

• Customization: Available
• Length: 2.5-5.5m
• Surface: No Defects, Oiling for Anti-Corrosion
• Model NO.: 6009/01(75.7*4.85)
• Certificate: Billets QC & Tube QC
• Straightness: 1mm/1000mm
• Transport Package: Bundle Packing with Trips and Plastic Bag
• Specification: OD(14-90mm); WT(2-12mm)
• Trademark: JOL
• Origin: Zhuji, Shaoxing, Zhejiang, China
• HS Code: 73045190
• Production Capacity: 180000 T/Year

Product Description

What is Bearing steel tube?

Bearing steel tube is hot-rolled or cold-rolled (cold-drawn) seamless steel tube for the manufacture of ordinary rolling bearing rings. The outer diameter of the steel tube is 25-180 mm, and the wall thickness is 3.5-20 mm. Bearing steel is used to make ball, roller and bearing ring . Bearing at work is under great pressure and friction, so the requirements of bearing steel has high and uniform hardness and wear resistance, as well as high elastic limit. It has strict requirements on the uniformity of the chemical composition of bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbide.

The physical properties of bearing steel are mainly to check the microstructure, decarburization layer, non-metallic inclusions and low-power structure.
Generally, hot rolling annealing and cold drawing annealing are used for delivery. The status of delivery shall be stated in the contract. The microstructure of steel must be free of shrinkage, subcutaneous bubbles, white spots and microscopic pores. Center loose, general loose must not exceed 1.5 grade, segregation must not exceed 2 grade.
The annealed structure of steel should be fine granular pearlite with uniform distribution. The depth of decarburization layer, non-metallic inclusion and non-uniformity of carbide should accord with relevant national standards.
Generally, if the diameter is less than 20mm, the goods shall be packed and delivered. If the diameter is larger than 20mm, the goods can be delivered naked. Specific pack requirement, inspect the contract requirement that both sides signs and decide, be like, hexagon pack, length is poor, exit should add outer packing commonly.

Cold drawn steel should be coated with anti-rust oil, some domestic manufacturers need goods, can not prevent rust, otherwise its processing into a ring when doing in addition to oil treatment. Before leaving the factory, the goods shall be accompanied with quality guarantee certificate, indicating steel number, furnace number, weight, specification, chemical composition, inspection standard and inspection result, etc.



:  OD*WT
 

Grade No.:GGr15 100Cr6     standard :GB18254-2002         size:mm       steel billets: xingcheng steel   Daye steel  Qingdao steel and other steel

2.0~2.49

2.5~2.99

3.0~4.09

4.1~4.59

4.6~5.09

5.1~5.59

5.6~6.09

6.1~7.09

7.1~8.09

8.1~9.09

9.1~10.09

10.1~12.59

12.6~14.09

14.1~18.09

14.0~16

16.1~18

18.1~20

20.1~24

24.1~26

26.1~28

28.1~32

32.1~35

35.1~40

40.1~45

45.1~50

50.1~55

55.1~63

63.1~68

68.1~80

80.1~86

86.1~95

95.1~110

110.1~120

120.1~130

 

Technical Conditions:

1. Material: 100Cr6  GCr15  (for example :Chinese correponding material GCr15-JL supplied by Daye Steel)

2. Hardness: 190~250HB (with or without final stress relief annealing),15HB hardness tolerance in each bundle

3. Coaxiliaty: wall thickness tolerance is +/-4% from nominal thickness and, min +/- 0.15mm

4. Straightness: 1mm/1m

5. Crack control: both ET and UT

6. Two tube ends to be chamfered

7. O.D. tolerance: till Fi 30mm      +0.2/-0;   

                           over Fi 30mm    +0.3/-0

8. W.T. tolerance: up to Fi 30mm    +/-4% from norminal wall thickness and min +/-0.15mm;

over Fi 30mm    +/-4% from norminal wall thickness and min +/-0.2, max +/-0.35

9. Quantity tolerance: +/-10%

10. Packing: Unique length in each bundle, anti-rust oil to be applied on material and bundle packing with strips with plastic band

Know more about us:

Established in 1999, Zhejiang Jianli is the biggest and No. 1 manufacturer in China specialized in producing cold drawn and rolled bearing steel tubes with OD range 12~130mm and Wall thickness range 2~18mm. Our production capacity and sales volume keep at the first place in China for over consecutive 20 years. 



Since 2017, Jianli has been carrying out equipment renewable reform and environment upgradation, completely using nature gas instead coal gas , adding a new set of anaerobic annealing furnace,three sets of piercing heated furnaces and two sets of magnetic-leakage+UT detection machines, upgrading acid pickling areas and other production investment.



Jianli had finished its strategic change in 2018, making true 80% capacity for medium and high -end precision tubes and 20% capacity for common tubes.

Furthermore,in order to improve pipe quality always and serve high-end customers, we have invested heavily in building a new workshop in 2021, introducing China's most advanced ARES(SMS Group) spheroidizing furnace and annealing furnace, new high-precision cold drawing & cold rolling equipment and testing equipment.



As China's first bearing steel tube brand and with annual output of tube around 200,000 tons,Jianli has built long term business with ,NSK,Timken and C&U,to be their main tube supplier proudly.



We Jianli has been growing up and always make ourselves prepared to work with our customers.