GB/T 24444-2026Electroslag remelting moulds (English PDF)

4.1 Classification

Electroslag remelting crystallizers (hereinafter referred to as "crystallizers") are classified into circular crystallizers and rectangular crystallizers according to their cross-sectional shape. Circular crystallizers... The schematic diagram is shown in Figure 1, and the schematic diagram of the rectangular crystallizer is shown in Figure 2.

4.2 Code Name

The product codes and cross-sectional shape codes for crystallizers are as follows.

a) Product code --- DZJ;

b) Circle---A;

c) Rectangle --- B.

4.3 Marking

6.1 Inner sleeve

6.1.1 The inner sleeve can be integrally formed by copper plate rolling and welding, copper ingot forging, or extrusion.

6.1.2 The material of the inner sleeve and inner sleeve flange shall conform to T2 or TP2 as specified in GB/T 2040-2017. The thickness of the inner sleeve shall conform to Table 3. Regulation.

6.1.3 The inner copper plate should be ultrasonically tested before and after rolling and welding. Forged or extruded cylinders should also be ultrasonically tested. The quality of ultrasonic testing, etc.

The grade should conform to Grade II as specified in NB/T 47013.3-2023.

6.1.4 After the inner sleeve is machined, a penetrant test shall be performed. The quality level of the penetrant test shall meet the requirements of Class I specified in NB/T 47013.5-2015.

6.1.5 The welding wire material for welded inner sleeves shall conform to the requirements of GB/T 9460. The weld shall undergo penetrant testing, and the quality grade of the penetrant testing shall be [not specified].

It conforms to Class I as specified in NB/T 47013.5-2015. The inner sleeve welds of circular crystallizers with a nominal weight greater than or equal to 50t should be inspected.

Ultrasonic testing shall be performed in accordance with the Class II standard specified in NB/T 47013.3-2023.

6.1.6 The welding wire material for the inner sleeve and inner flange shall comply with the requirements of GB/T 9460. The weld shall undergo penetrant testing, and the quality of the penetrant testing shall be assessed.

The grade should conform to Grade I as specified in NB/T 47013.5-2015.

6.1.7 The limit deviations of the inner cavity dimensions of the inner sleeve shall conform to Class V specified in GB/T 1804-2000.

6.1.8 The straightness tolerance of the inner surface of the inner sleeve is 2mm within a length range of 1000mm.

6.1.9 The tolerance for the perpendicularity of the inner sleeve axis to the inner sleeve flange plane within a length range of 1000mm is 2mm.

6.1.10 The surface roughness (Ra) values of the inner and outer surfaces of the inner sleeve and the inner flange surface shall not exceed those specified in GB/T 1031-2009. 6.3µm.

6.1.11 The inner sleeve surface should be free of burrs and mechanical damage with a depth exceeding 1 mm.

6.2 Outerwear

6.2.1 The outer casing should be equipped with a descaling port and an air vent valve; if there are special requirements, a pressure relief valve should be installed.

6.2.2 The materials of the outer flange, the upper flange of the outer flange, and the lower flange shall conform to the provisions of GB/T 4237 or GB/T 700, and the thickness of the outer flange should preferably be 8mm.

20mm. A non-destructive testing report from the manufacturer should be available when purchasing steel plates.

6.2.3 The outer casing of circular crystallizers with a nominal weight greater than or equal to 50t shall undergo penetrant testing after processing, and the quality level of the penetrant testing shall be... It meets the Class I standard specified in NB/T 47013.5-2015.

6.2.4 The outer weld should use welding wire that meets the requirements for copper-steel welding. The weld should undergo penetrant testing, and the quality level of the penetrant testing should meet the following requirements. Level I as specified in NB/T 47013.5-2015.

6.2.5 The coating on the outer surface should conform to the requirements of HG/T 3362. The coating should be uniform and free from omissions, accumulations, and bubbles.

6.2.6 The perpendicularity of the outer flange axis to the plane of the upper and lower flanges of the outer flange shall be 2 mm within a length of 1000 mm.

6.2.7 The surface roughness (Ra) value of the upper and lower flanges shall not exceed 6.3 µm as specified in GB/T 1031-2009.

6.3 Water-guiding structure

6.3.1 The water guiding structure is made of stainless steel plate by roll welding. The design range of the gap between the water guiding structure and the inner sleeve should be 5mm~15mm.

The design range for the gap between the frame and the outer jacket should be 20mm to 80mm.

6.3.2 The material of the water guiding structure shall comply with the provisions of GB/T 4237, and the thickness should preferably be 3mm~5mm.

6.3.3 The water-conducting structure shall be subjected to permeability testing, and the permeability testing quality level shall meet the requirements of Class I specified in NB/T 47013.5-2015.

6.4 Welds

The weld should be full and free from defects such as cracks, slag inclusions, dense porosity, incomplete penetration, and undercut. The weld should be cleaned after welding to remove weld beads.

Slag, spatter, and weld beads should be removed, and the weld should be ground smooth.

6.5 Overall sealing performance

The water cooling system of the crystallizer should be sealed and leak-free after a water pressure test. The sealing test shall meet the following conditions. a) Medium. Water.

b) Water temperature. room temperature.

c) Test pressure. not less than 1.5 times the working pressure.

d) Stabilization time. >=4h.

7.1 Materials

7.1.1 Chemical analysis of the inner sleeve material shall be performed in accordance with the methods specified in GB/T 5121 (all parts).

7.1.2 Chemical analysis of the outer material shall be performed in accordance with the methods specified in GB/T 4237 or GB/T 700.

7.1.3 Chemical analysis of water-conducting structural materials shall be carried out in accordance with the methods specified in GB/T 4237.

7.1.4 Ultrasonic testing of the inner sleeve copper plate before and after welding shall be carried out in accordance with the method specified in NB/T 47013.3-2023.

7.1.5 Ultrasonic testing of forged or extruded cylinders shall be performed in accordance with the method specified in NB/T 47013.3-2023.

7.2 Welds

7.2.1 Ultrasonic testing of the weld seams of the inner sleeve of a circular crystallizer with a nominal weight greater than or equal to 50t shall be performed according to the method specified in NB/T 47013.3-2023. conduct.

7.2.2 Surface penetrant testing of welds shall be carried out in accordance with the method specified in NB/T 47013.5-2015.

7.2.3 Penetrant testing of stainless steel or carbon steel plate welds shall be carried out in accordance with the method specified in NB/T 47013.5-2015.

7.2.4 Penetration testing of the weld between the inner sleeve and the inner sleeve flange shall be carried out in accordance with the method specified in NB/T 47013.5-2015.

7.3 Surface Quality

7.3.1 Visual inspection before and after inner sleeve machining shall be carried out in accordance with the method specified in NB/T 47013.7.

7.3.2 Visual inspection of the outer garment after all processing is completed shall be carried out in accordance with the method specified in NB/T 47013.7.

7.3.3 Visual inspection of all water-guiding structures after processing shall be carried out in accordance with the method specified in NB/T 47013.7.

7.3.4 Visual inspection of the coating quality on the surface of the crystallizer shall be carried out in accordance with the method specified in NB/T 47013.7.

7.3.5 Penetration testing after inner sleeve processing shall be carried out according to the method specified in NB/T 47013.5-2015.

7.3.6 The penetrant testing of the outer casing of circular crystallizers with a nominal weight greater than or equal to 50t after processing shall be in accordance with NB/T 47013.5-2015. It is carried out in a predetermined manner.

7.3.7 The permeability test of the water-conducting structure shall be carried out in accordance with the method specified in NB/T 47013.5-2015.

7.4 Taper

7.4.1 The taper of the circular crystallizer shall be tested according to formula (1).

7.4.2 The taper test of the rectangular crystallizer shall be calculated according to formula (2) or formula (3).

8.1 Inspection Items

The test items are shown in Table 4.

8.2 Qualification Criteria

All test items met the requirements of Chapter 6 and were deemed qualified.

9.1 Marking

The logo content includes, but is not limited to.

a) Product Name;

b) Product model;

c) Factory serial number;

d) Manufacturing date;

e) Name of the manufacturing company.

9.2 Accompanying Documents

The following documents should be included with the product upon delivery.

a) Product certificate;

b) Product operation and maintenance manual.

9.3 Packaging

The packaging of crystallizers should meet the following requirements.

a) Meet transportation requirements;

b) Complies with the requirements of GB/T 13384;

c) Before packaging, remove any residual moisture from the water jacket and seal the inlet and outlet.

d) Coat the copper surface with protective oil before packaging.

9.4 Transportation and Storage

The transportation and storage requirements for crystallizers are as follows.

a) During transportation, it should not be exposed to rain or come into contact with acids, alkalis, organic solvents, or similar substances. During loading and unloading, it should be handled with care and should not be dropped. Throwing, rolling, stomping, and pressing.

b) It should be stored in a clean, dry, well-ventilated environment protected from direct sunlight and rain. During storage, it should not come into contact with acids, alkalis, organic solvents, or other chemicals. Substance contact.