Hollow Steel 35 Square Steel Steel Pipes Cold Deformed Seamless GOST 8639-82

GOST 8639-82 steel 35 square steel steel pipes , cold deformed seamless hollow section steel tubes

Sizes of square pipes have to confirm the values indicated in the table below:

Steel density 7/85 g/cm3

Pipe static characteristic is calculated for R=1,5 s

4. Bending radius R should no more than 2 s.

5. Pipes are produced:

Random length

Seamless cold-deformed – 1.5-11m;

Fixed length

Seamless cold-deformed – 4.5-11m;

Multiple lengths

Seamless cold-deformed – 1.5-11m with tolerance for every cut 5 mm;

Total length of multiple length pipes can’t be more than upper limit of fixed length pipe. Tolerance for every ratio is 5mm (if other tolerance is not stipulated) and is a part of every ordered ratio.

6.Limit deviations for outside sizes, wall thickness & sides concavity can’t be more than indicated in the table below:

7. Thickness variation can’t lead the wall out the limit deviations concerning wall thickness.

8. In pipe cross-section the deviation from right angle can’t be more than ±1.5°.

9. Pipe curvature can’t be more than 2 mm for 1m of length.

Pipes are produced without adjustment, in this case curvature is not regulated.

Zhejiang New Era Steel Tube Technology Co., Ltd is one of the best seamless steel tube products manufacturer and exporter in china. Our main products include cold drawn and cold rolled seamless steel tubes .We can manufacture non-standard and special application tubes, also according to the international standards as well. Ningbo Pipeway Trade Co.,Ltd is our branch company for all internation business service for our company.

Our Production equipments including 16 cold drawing lines and 22 cold rolled machines:

We have full testing equipments for different kinds of testing for steel tubes:

Our products can produced as DIN,ASTM,ASME,EN,JIS,BS,GB,GOST,ISO etc international standard 

Precision steel tubes:DIN2391 st52/A519 4130 4140 1026/EN10305-1 E355+N/EN10305-4 E235+N

Boiler steel tubes:ASTM A192/A179/A210 Gr.A/A213;DIN17175 st35.8/EN10216

Seamless Mechanical tubes: ASTM A519, EN10297-1/EN10210 S355J2H

Wire line Drill Rods:BQ,NQ,HQ,PQ XJY750,XJY850 4130+SR 1541

Oil and Gas line pipes:API 5L Grade B,A106 Gr.B,A53 Gr.B,API 5D

Stainless Steel tubes 304,304L,316,316L

Steel pipes and tube Size range:OD 4-300mm,Wt:0.5-30mm

We have 15 years experience of exporting steel tubes and steel pipes , main exporting to American, Europe, Asian, Australia, Africa .

We have cerficate of ISO9001,TS16949,TUV/PED for different market demand: