Why do we need to anneal when the raw material of the sleeve is cold rolled precision seamless steel

The ductility of the sleeve after annealing of the raw material is better, that is, the yield strength is better.

Wuxi Duorunde steel pipe **** (I will answer); When the sleeve raw material is cold-rolled precision seamless steel pipe, the main purpose of annealing is to improve the mechanical properties and processing properties of the material. Here is a detailed explanation of why annealing is needed:

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1.Reduced hardness: During the cold rolling process, the steel pipe undergoes plastic deformation, resulting in its grain boundary slippage and increased dislocation, thereby improving the hardness and strength of the material.

Annealing can reduce hardness through grain growth and internal stress relief, making the material more malleable.

2.Improved ductility: The annealing process increases the grain size of the material, reduces the number and length of grain boundaries, and also eliminates internal stresses due to plastic deformation.

This will help improve the ductility and toughness of the material, making it easier for the next processing operations such as stamping, drawing, etc.

3.Improve surface quality: Cold-rolled precision seamless steel pipes may have problems such as increased surface roughness, wrinkles, scratches and other problems during cold working.

With proper annealing treatment, the metal surface can be restored to a flat and better finish, improving the appearance quality of the product.

4.Elimination of residual stress: There may be some residual stresses inside the cold-rolled precision seamless steel pipe, which will affect the performance and stability of the material during use.

Annealing can release and eliminate the stress inside the material, improving its overall stability and ductility.

5.Prepare for post-processing: Annealing also provides a better material condition for subsequent processing steps.

Annealing is an important process step in the production process of cold-rolled precision seamless steel pipes, which provides a better basis for the subsequent processing and use of materials by reducing hardness, improving ductility, improving surface quality, and eliminating residual stress.

Cold-rolled precision seamless steel pipe is a kind of seamless steel pipe with high dimensional accuracy and good surface finish for precision mechanical structures, hydraulic equipment or steel sleeves.

Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-83) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. The selection of precision seamless steel pipes to manufacture mechanical structures or hydraulic equipment, etc., can greatly save machining man-hours, improve material utilization, and help improve product quality.

Precision steel pipe is a kind of high-precision steel pipe material after cold drawing or cold rolling. Because the inner and outer walls of precision steel pipes have no oxide layer, withstand high pressure without leakage, high precision, high finish, cold bending without deformation, flaring, flattening without cracks, etc., they are mainly used to produce pneumatic or hydraulic components of products, such as cylinders or cylinders, which can be seamless pipes and welded pipes (after cold rolling treatment).

The main chemical components of precision steel pipes are iron, Fe, carbon, silicon, Si, manganese, Mn, sulfur, phosphorus, chromium, Cr

Mechanical properties of precision seamless steel pipes

Tensile Strength b (MPa): 868 Conditional Yield Strength (MPa): 713 Elongation δ5 (%).

17Elongation δ10 (%11 Section shrinkage 62 Impact toughness value ku (j cm2):

5. Specimen size: a specimen.

Precision seamless steel pipe heat treatment specification and metallographic structure: heat treatment specification: 900 normalizing, 600 tempering. Metallographic structure: tempered bainite + a small amount of tempered sostenite.

Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-2000) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. High-precision cold-drawn precision steel pipe is a new type of high-tech energy-saving product. The promotion and application of high-precision cold-drawn precision steel pipes saves steel, improves processing efficiency, and saves energy The main materials and mechanical properties of precision seamless steel pipes in Dexin Steel Industry

The raw materials used in the precision pipe department of Dexin Steel are mainly ST35 produced by Shanghai Baosteel, etc. The mechanical properties and process properties of the steel pipes produced by the precision pipe department of Dexin Steel are excellent, and the steel pipes can withstand high pressure and impact, which is especially suitable for the hydraulic machinery and auto parts industry. The steel pipe can be cold-bent and deformed at any angle, flared and flattened without cracks, and is suitable for industries that require various bending and deformation processing.

1. Different classifications:

Hot-rolled seamless pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

In addition to general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, cold-rolled seamless steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes.

2. The process flow is different

Hot rolled seamless steel tube round tube billet Heating Perforation Three-high skew rolling, continuous rolling or extrusion Tube removal Sizing Cooling Billet straightening Hydrostatic test Marking Warehousing.

Seamless steel tube round tube billet heating, perforation, heading, annealing, pickling, oiling, multi-pass cold drawing, billet tube, heat treatment, straightening, hydrostatic test, marking, warehousing.

After hot rolling, the non-metallic inclusions (mainly sulfides and oxides, as well as silicates) inside the steel are pressed into thin sheets, resulting in delamination (interlayering). Delamination greatly deteriorates the tensile properties of the steel along the thickness direction, and interlaminar tearing is possible when the weld shrinks. The local strain induced by weld shrinkage often reaches several times of the yield point strain, which is much larger than the strain caused by the load.

Hot-rolled steel pipes are generally large-diameter thick-walled steel pipes, low-pressure and medium-pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

Cold-rolled (dialed) seamless steel pipes are generally small-diameter thin-walled pipes, low- and medium-pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, as well as carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes.

Sage May 8 13:21 Seamless steel pipe implementation standard 1, structure for seamless steel pipe: GB8162-99

2. Ground seam steel pipe for conveying fluid: GB8163-993, seamless steel pipe for boiler: GB3087-19994, high-pressure seamless pipe for boiler:

GB5310-95 (type) 5, high-pressure seamless steel pipe for fertilizer equipment: GB6479-19996, seamless steel pipe for geological drilling: YB235-70

7. Seamless steel pipe for oil drilling: YB528-65

8. Seamless steel pipe for petroleum cracking: GB9948-889, seamless pipe for oil drill collar: YB691-70

10. Seamless steel pipe for automobile half shaft: GB3088-199911, seamless steel pipe for ship: GB5312-199912, cold-drawn and cold-rolled precision seamless steel pipe

GB3639-199913, various alloy tubes 16Mn, 27Simn, 15CrMo, 35CrMo, 12CrMoV, 20G, 40Cr, 12Cr1MoV, 15CrMo

Seamless steel pipes are generally made of very common materials

##.q345b,16mn,40cr,42crmo,27simn,12cr1mov,15crmo,gcr15，25mn2.

Generally, steel pipes are made of these materials, and I hope they can help you.

Q: What is the material of seamless steel du pipe?

Zhi? Answer: The materials of small-diameter non-DAO seam steel pipe are: special 10, genus 20, 16mn, 27simn crmo cr1mov crmo910, t91, p91, j55, k55, q345, cr5mo2, etc.

Thick-walled steel pipes.

Precision seamless steel pipe is a kind of high-precision steel pipe after cold rolling or cold drawing; Full name: cold-rolled or cold-drawn precision seamless steel pipe. Due to the advantages of no oxide layer on the inner and outer walls of precision seamless steel pipes, no leakage under high pressure, high precision, high finish, no deformation in cold bending, flaring, flattening without cracks, etc., products mainly used to produce pneumatic or hydraulic components, such as cylinders or cylinders, are made of seamless pipes.

The chemical composition of precision seamless steel pipe is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, and chromium Cr.

The content comes from the user: looking forward to a better future.

Seamless steel pipe material.

1. Small-caliber high-pressure boiler tubes for automobiles (special for Buick cars) are produced according to domestic and foreign standards or industry standards: 210C, 15CrMoG, 12Cr1Movg, T12 T91 series steel pipes, 2, line pipes for West-East Gas Transmission Station, GB L245NB, 1146, 895, etc. 3, submarine oil pipeline line pipe API5L X52 PSL2 8910

4. Oilfield pipe N80 non-quenched and tempered pipe API 5ct J55 tubing API 5CT

5. Truss arm special pipe (integral quenched and tempered pipe) protocol standard, 20Mn2B, 20Mn2, 14615, etc., used for crawler tower crane lifting equipment 6, special cylinder barrel and bracket tube T91, steel 102 series high-pressure boiler tube GB5310-1995, used in high temperature and high pressure environment of thermal power station 7, tractor rear axle tube 35MnVN, crawler tractor rear axle tube 8, ultra-high strength structural pipe 35CrMnSi, 30CrMnSinin2A, used in military industry, Aircraft landing gear pipe 9, axle pipe 20Mn2, 17812, 12719 and so on 10, gangue pipe agreement standard J55, 266, 316, etc., used for highways, large hydropower station dam reinforcement 11, hydraulic pillar pipe GB T Simn, used for coal machine underground operation support fixation according to the American standard production of boilers and superheaters with carbon steel seamless steel pipe ASTM A C, 606

12. Automobile half-shaft bushing YB T Mn2 45

13. Extra-long heat exchanger tube 20, 19216000-21000, used for heat exchanger 14, seamless tube CR-1, 485 for fork rod, CR bogie cross rod 15 for train speed, directional spiral special-shaped seamless tube for rocket artillery

16. Seawater corrosion resistant pipe Q CG CRMOA1, 1084

17. Submersible motor shaft tube protocol standard 3111, seamless steel pipe for fertilizer equipment and seamless steel pipe for high-pressure vessel ASTMA53-199

Statement: This Q&A is provided by Jiangxi Nanchang seamless thick-walled steel pipe manufacturer to give you a professional answer to what is the material and use of seamless steel pipe

Within 1. High-pressure fertilizer pipes.

10 20 16mn

gb6479-2000

It is suitable for chemical equipment and pipelines with a working temperature of -40-400 and a working pressure of 10-32MPa.

2.Fluid delivery tubing.

##astm a106a,b,c、a53a,b16mngb/t8163-2008astm a106astm a53∮8-1240*1-200

A general seamless steel pipe suitable for conveying fluids.

3.General Structural Tubes.

###、27simnastm a53a,b16mngb/t8162-2008gb/t17396-2009astm a53

It is suitable for general structure, engineering support, machining, etc.

4.Oil casing.

j55、k55、n80、l80c90、c95、p110 api spec 5ctiso11960

Tubing is used to extract oil or gas casing in oil wells, and is used as a wellbore for oil and gas wells.

The material of small diameter seamless steel pipe: 10 16mn 27simn 15crmo 12cr1mov 10crmo910 t91 p91 j55 k55 q345 cr5mo2)20

35, 16mn, 27simn3), 10, 16mn, 27simn, 12cr1mov, 10crmo crmo, etc. References.