X2Cr13 + QT conveyor roller of rolling mill

roller

X2Cr13 + QT conveyor roller of rolling mill:

Products type: X2Cr13 Conveyor roller of rolling mill.

Producing Date:2015-1.

Material: X2Cr13 + QT conveyor roller

Forgings, Martensitic stainless steel.

Country:Germany.

Client:SMSDEMAG.

The  conveyor roller of rolling mill producing process: Forged round  of martensite—- Tempered —- Rough machining—- Finishing —-Inspection— Packaging.

The material is a chrome-alloyed heat treatable steel with medium carbon content which is rust proof. It has a good corrosion resistance because of its chrome content in moderate aggressive, non chloric substances like soap, solvents and organic acid.

This material shows its highest corrosion resistance with fine grinded and polished surface. The machinability of the material is comparable with alloyed heat treatable steels and causes no significant difficulties.

The material can be hardened by holding the temperature between 950°C and 1050° C with a subsequent cooling in air, oil or polymer. The strength of the material depends on the tempering temperature.It is usually divided in two heat treatment conditions, QT700 and QT800. This material is used in mechanical engineering and power engineering.

X2Cr13 roller
X2Cr13 + QT conveyor roller of rolling mill

 

 

 

roller
X2Cr13 conveyor roller of rolling mill

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stainless steel pipe 420 heat treatment process

Stainless steel pipe 420 heat treatment process

420,430 steeltube
420,430 steeltube

To ensure high strength, high wear resistance and high corrosion resistance, martensitic stainless steel pipe 420 is subjected to have heat treatment which includes softening treatment, quenching and tempering.

By air cooling after forging rolling martensite can be obtained. In order to reduce the hardness, improve its cutting performance, meanwhile in order to eliminate the stress and prevent cracking, the softening treatment should be conducted. Normally have two methods. One is high temperature tempering. The forging is heated to 700-800 ℃, insulation 2- 6 h then air-cooled, the martensite transform to sorbitic, the hardness reduced. After treated the hardness of stainless steel pipe 410 is 170一200 HBS. Stainless steel pipe 420 will be 200-230 HBS. The another one is fully annealed which means heat the forging to 840一900℃, insulation 2-4h, cooling down to 600℃ with the speed greater than or equal to 25℃/h, then air-cooled. The hardness of stainless steel pipe 420 will be reduced to below 170HBS and stainless steel pipe 430 will be reduced to below 217HBS.

Quench of martensitic stainless steel pipe 420: carbides dissolved gradually accompany with the quench temperature rise. Corresponding increases in hardness after quenching. For 3Crl3 & 4Cr13 the temperature should be higher to ensure full dissolution of carbides because of higher carbon content. Normally the heat range is 1000一1050`C. For stainless steel pipe 420 the lower range and for stainless steel pipe 430 high range.

Characteristics of X20cr13|420 stainless steel pipe

special alloy tube

Standard: AISI420UNS42000, DIN 17440

X20Cr13|420 stainless steel features and scope of application: High hardness at quenching condition, good corrosion resistance. The density of X20Cr13|420 stainless steel is 7.75g/cm3. The quenching hardness of X2Cr13|420 stainless steel: In general X2Cr13|420 stainless steel quenching temperature at 980 1050 . The hardness at 980 oil quenching is obviously lower than 1050 oil quenching. The hardness at 980 oil quenching is 4550HRC. The hardness at 1050 oil quenching is higher than 2HRC. However, the grain is coarse and brittleness. Recommend the use of 1000 quenching hardness can be obtained and good organization.

STAINLESS STEEL PIPE
420 stainless steel

 

  X20cr13|420 stainless steel needs to preheat before welding. It’s no need preheating for welding Q235 with austenitic stainless steel electrode such as A302 and A307. There should control dilution rate, not swing and smaller current used while welding.

 

Welding consumables can be selected as following:

1. Atmospheric corrosion resistance: G202 and G207preheat 150-300 , 700-730 tempering after welding.

2. Organic acid resistant and heat-resistant: G211, preheat 150-300 .

3. Good plasticity: A102, A107, A202, A207, A302 and A307, preheating for repair welding or thick bulky.

 

Chemical composition

C 0.160.25

Si1.00

Mn1.00

S 0.030

P 0.035

Cr12.0014.00

Niallowed contain 0.60

Martensitic stainless steel pipe 410, 420, 430

Martensitic stainless steel pipe 410, 420, 430
Martensitic stainless steel pipe 410, 420, 430

Martensitic stainless steels Martensitic stainless steel pipe 410, 420, 430 etc.are similar to low alloy or carbon steels, having a structure similar to the ferritic steels. However, due the addition of carbon, they can be hardened and strengthened by heat treatment, in a similar way to carbon steels. The main alloying element is chromium, typically 12 to 15%, molybdenum (0.2-1%), no nickel, except for two grades, and 0.1-1.2% carbon.

Commonly used grades are:

Martensitic stainless steel  pipe 410, 420, 430 etc.

 

 

 

Features:

1) Grade of steel: 410, 410S, 420J1, 430

2) OD: 18 – 760mm

3) Thickness: thick-walled

1Cr13 410/410S21/SUS410 / AISI410/ TP410/X10Cr13/ 1.4006/ DIN17440

2Cr13 420/420S37/SUS420J1/ AISI420/ X20Cr13/ 1.4021 / DIN17440

1Cr17 430/430S15/SUS430 / TP430/TP429/X8Cr17/ 1.4016/ DIN17440

Material: 410/ AISI410/ TP410/ 1.4006 ,

420/ AISI420/ 1.4021 ,

430/TP430/TP429/1.4016

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