TPT July 2011

A rticle

Test result: Friction coefficient

Material, formed method of roll block Straightening quantity by wear 1mm on radius direction of roll X155CrVMo121 forging steel roll 10,000 ton high chromium alloy casting roll 12,000 ton Table 2: The contrast of rolls’ wear resistance property of hot straightening Material, formed method of roll block Straightening quantity by wear 1mm on radius direction of roll X165CrMoV12KU forging steel roll 18,000 pieces 9Cr2Mo forging steel roll 18,000 pieces high chromium alloy casting roll 38,200 pieces Table 3: Contrast of rolls’ wear resistance property of cold straightening 4. Popularisation and utilisation High chromium alloy cast roll has been exported to Korea, Israel, Kazakstan, South Africa, India, Russia, Oman, etc, and it has been applied by tens of large size metallurgical enterprises and machinery manufacture enterprises. More than twenty of the above mentioned enterprises are listed in top five hundred enterprises of manufacturing industry of China. In China the market share of high chromium alloy straightening roll for seamless pipe is up to 80%, and all the advanced mills and key enterprises producing seamless pipes have been covered. 5. Conclusion High chromium alloy casting rolls for pipe straightening, HFW/ ERW welding pipe and cold roll forming steel, researched and developed by Shandong Province Sifang Technical Development Co Ltd, successfully meet the requirements of producing high-grade alloy pipe and fit the advanced steel pipe production mills. The utilisation property and service life of high chromium alloy casting roll is comparable to the forged steel rolls made of materials as D2, X155CrVMo121 and SKD11. Compared with forged steel rolls,

Figure 10: The average friction coefficient of the materials Wear quantum of volume

Figure 11: Wear quantum of volume of materials

Figure 12: Average wear quantum of volume of materials

Table 1: Mechanics property test for material sample

Tensile Strength MPa

Impact Toughness J/cm 2

No.

Material

Sample No.

Data 732.7 717.1 683.3 745.5

Average Data

Data

Average Data

1 2 3 1 2 3 1 2 3 1 2

4

A

X155CrVMo121

711

2.1

3

3

2.3 3.5 3.5

B

D2

771 683

733

3.1

1038.9 1111.7 1320.8

12.3

C

SKD11

1157

9

12.8

17 11

511 503

14.6

high chromium alloy (casting state, eliminated stress temper)

500

13.5

D

3

485.9

14.8

1 2 3

557 511

7

high chromium alloy (quenching, temper state)

540

8.5 6.9

7.5

E

552.2

130

J uly 2011

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