GB/T 17493-2018Tubular cored electrodes for creep-resisting steels (English PDF)

3.1 Model division

The wire type is drawn according to the mechanical properties of the deposited metal, the use characteristics, the welding position, the type of shielding gas and the chemical composition of the deposited metal.

Minute. Refer to Appendix C for the comparison of this standard with other related standards for flux cored wire.

3.2 Model preparation method

The wire type consists of six parts.

1) Part 1. The fuse "wire" is indicated by the letter "T";

2) The second part. indicates the tensile strength code of the deposited metal, see Table 1;

3) The third part. indicates the use of the feature code, see Table 2;

4) Part IV. indicates the welding position code, see Table 3;

5) Part 5. indicates the type of protective gas type, the code of the protective gas is in accordance with ISO 14175, see Appendix D;

6) Section 6. Indicates the chemical composition of deposited metal, see 4.3, and Appendix E for the classification.

In addition to the above mandatory code, an optional code can be appended to it.

Diffusion hydrogen code "HX", where "X" can be the number 15, 10 or 5, respectively representing the maximum amount of diffusible hydrogen per 100 g of deposited metal

Value (mL), see 4.6.

The wire type examples in this standard are as follows.

Example 1.

T 55 T5-0 M21-1CM H5

Optional additional code means that the diffused hydrogen content of the deposited metal is not more than 5mL/100g

Indicates the chemical composition of deposited metal

Indicates the type of protective gas, "M21" means the gas composition is (15%) \u003cCO2 <=25%) Ar

Indicates the welding position, "0" indicates the flat welding and the fillet welding position

Indicates the use characteristics, "T5" indicates that the core type is calcium oxide-fluoride, using DC reverse or

DC positive connection, coarse drop transition, etc.

Indicates the tensile strength of the deposited metal, and "55" indicates a minimum of 550 MPa.

Flux cored wire

Example 2.

T 62 T15-1 M13-2C1M

Indicates the chemical composition of deposited metal

Indicates the type of shielding gas, "M13" indicates that the gas composition is (0.5% <= O2 <= 3%) Ar

Indicates the welding position, "1" indicates the full position

Indicates the use characteristics, "T15" indicates that the core type is metal powder type, using DC

Reverse connection, fine droplet ejection transition, etc.

Indicates the tensile strength of the deposited metal, and "62" indicates a minimum of 620 MPa.

Flux cored wire

Table 1 deposited metal tensile strength code

Tensile strength code

Tensile strength Rm

MPa

49 490~660

55 550~690

62 620~760

69 690~830

Table 2 Use feature code

Use characteristic code to protect gas current type droplet transfer form core type welding position a characteristic

T1 requires DC reverse jet injection transition rutile 0 or 1

Splash small, flat or slightly convex weld bead, melt

High speed

T5 requirements

DC reverse connection or

DC positive connection

Coarse drop transition

Calcium Oxide-

Fluoride

4.1 Wire size and surface quality

The wire size and surface quality shall comply with the provisions of GB/T 25775.

4.2 T-joint fillet weld

4.2.1 Specimen inspection of fillet welds shall be in accordance with GB/T 25774.3, where the unfused length of the weld root shall not exceed the total length of the weld

20%.

4.2.2 The weld crown and the difference between the lengths of the two weld legs shall comply with the requirements of Table 4.

Table 4 Weld crown and the difference between the two legs are in millimeters

Welded foot size weld crown degree difference between two solder legs

< 7.0 <=2.0

>=7.0 <=2.5

<= (0.5 x solder fillet size -0.5)

4.3 Chemical composition

The chemical composition of the deposited metal of the wire shall comply with Table 5.

Table 5 Chemical composition of deposited metal

chemical composition

classification

Chemical composition (mass fraction)a

C Mn Si PS Ni Cr Mo V

2M3 0.12 1.25 0.80 0.030 0.030 - - 0.40~0.65 -

CM 0.05~0.12 1.25 0.80 0.030 0.030 - 0.40~0.65 0.40~0.65 -

CML 0.05 1.25 0.80 0.030 0.030 - 0.40~0.65 0.40~0.65 -

1CM 0.05~0.12 1.25 0.80 0.030 0.030 - 1.00~1.50 0.40~0.65 -

1CML 0.05 1.25 0.80 0.030 0.030 - 1.00~1.50 0.40~0.65 -

1CMH 0.10~0.15 1.25 0.80 0.030 0.030 - 1.00~1.50 0.40~0.65 -

2C1M 0.05~0.12 1.25 0.80 0.030 0.030 - 2.00~2.50 0.90~1.20 -

2C1ML 0.05 1.25 0.80 0.030 0.030 - 2.00~2.50 0.90~1.20 -

2C1MH 0.10~0.15 1.25 0.80 0.030 0.030 - 2.00~2.50 0.90~1.20 -

5CM 0.05~0.12 1.25 1.00 0.025 0.030 0.40 4.0~6.0 0.45~0.65 -

5CML 0.05 1.25 1.00 0.025 0.030 0.40 4.0~6.0 0.45~0.65 -

9C1Mb 0.05~0.12 1.25 1.00 0.040 0.030 0.40 8.0~10.5 0.85~1.20 -

9C1MLb 0.05 1.25 1.00 0.040 0.030 0.40 8.0~10.5 0.85~1.20 -

9C1MVc 0.08~0.13 1.20 0.50 0.020 0.015 0.80 8.0~10.5 0.85~1.20 0.15~0.30

9C1MV1d 0.05~0.12 1.25~2.00 0.50 0.020 0.015 1.00 8.0~10.5 0.85~1.20 0.15~0.30

GXe other agreement components

Note. The single values in the table are the maximum values.

a Chemical analysis should be performed according to the elements specified in the table. If other elements are found during the analysis, the total amount of these elements (except iron) should not exceed

0.50%.

b Cu <= 0.50%.

c Nb. 0.02%~0.10%, N. 0.02%~0.07%, Cu<=0.25%, Al<=0.04%, (Mn Ni)<=1.40%.

d Nb. 0.01% to 0.08%, N. 0.02% to 0.07%, Cu <= 0.25%, and Al <= 0.04%.

The categories not listed in the e table can be represented by similar classifications, prefixed with the letter "G". The chemical composition range is not specified, and it is not possible between the two classifications.

replace.

4.4 Mechanical properties

The tensile test results of the deposited metal shall comply with the requirements of Table 6.

Table 6 Mechanical properties of deposited metal

Wire type

Tensile strength Rm

MPa

Prescribed plasticity

Extension strength Rp0.2

MPa

Elongation after break A

Preheating temperature and

Inter-channel temperature

Post-weld heat treatment

Heat treatment temperature

Holding time

Min

T49TX-XX-2M3 490~660 >=400 >=18 135~165 605~635 60 15 0

T55TX-XX-2M3 550~690 >=470 >=17 135~165 605~635 60 15 0

T55TX-XX-CM 550~690 >=470 >=17 160~190 675~705 60 15 0

T55TX-XX-CML 550~690 >=470 >=17 160~190 675~705 60 15 0

Table 6 (continued)

Wire type

Tensile strength Rm

MPa

Prescribed plasticity

Extension strength Rp0.2

MPa

Elongation after break A

Preheating temperature and

Inter-channel temperature

Post-weld heat treatment

Heat treatment temperature

Holding time

Min

T55TX-XX-1CM 550~690 >=470 >=17 160~190 675~705 60 15 0

T49TX-XX-1CML 490~660 >=400 >=18 160~190 675~705 60 15 0

T55TX-XX-1CML 550~690 >=470 >=17 160~190 675~705 60 15 0

T55TX-XX-1CMH 550~690 >=470 >=17 160~190 675~705 60 15 0

T62TX-XX-2C1M 620~760 >=540 >=15 160~190 675~705 60 15 0

T69TX-XX-2C1M 690~830 >=610 >=14 160~190 675~705 60 15 0

T55TX-XX-2C1ML 550~690 >=470 >=17 160~190 675~705 60 15 0

T62TX-XX-2C1ML 620~760 >=540 >=15 160~190 675~705 60 15 0

T62TX-XX-2C1MH 620~760 >=540 >=15 160~190 675~705 60 15 0

T55TX-XX-5CM 550~690 >=470 >=17 150~250 730~760 60 15 0

T55TX-XX-5CML 550~690 >=470 >=17 150~250 730~760 60 15 0

T55TX-XX-9C1M 550~690 >=470 >=17 150~250 730~760 60 15 0

T55TX-XX-9C1ML 550~690 >=470 >=17 150~250 730~760 60 15 0

T69TX-XX-9C1MV 690~830 >=610 >=14 150~250 730~760 60 15 0

T69TX-XX-9C1MV1 690~830 >=610 >=14 150~250 730~760 60 15 0

TXXTX-XX-GX agreement between supply and demand

4.5 Weld ray flaw detection

Weld ray flaw detection shall comply with the Class II regulations of GB/T 3323.

4.6 deposited metal diffusion hydrogen content

According to the negotiation between the supplier and the buyer, if the diffusion hydrogen code is added after the wire type, it should meet the requirements of Table 7.

Table 7 Diffusion hydrogen content of deposited metal

Diffusion hydrogen code

Diffusion hydrogen content

mL/100g

H5 <=5

H10 <=10

H15 <=15

5.1 Wire size and surface quality

5.1.1 Size

The wire diameter is inspected with a measuring tool with an accuracy of 0.01 mm, measured at the same position perpendicular to each other, and the measuring portion is not less than two.

5.1.2 Surface quality

The surface quality of the welding wire shall be visually inspected for any part of the welding wire according to the provisions of GB/T 25775.

5.2 T-joint fillet weld test

5.2.1 Test base metal

The test plate is made of unalloyed steel having a carbon content of not more than 0.30%.

5.2.2 Preparation of test pieces

The test piece preparation of the T-joint fillet weld test was carried out in accordance with GB/T 25774.3. Welding parameters and wire diameter for testing by manufacturer

recommend. For welding wire with welding position code "0", fillet weld test should be carried out at the position of PB; for welding position code "1"

For the welding wire, the fillet weld test shall be carried out at the position of PE and PF (or PG).

5.3 Chemical analysis

5.3.1 Chemical analysis of deposited metal samples shall be prepared in accordance with the provisions of GB/T 25777, or on the tensile test bars of mechanical properties or after breaking.

Made. When the arbitration test is conducted, it shall be carried out in accordance with the provisions of GB/T 25777.

5.3.2 Chemical composition analysis may be carried out by any suitable analytical method. In the arbitration test, the analysis method is confirmed by both the supplier and the buyer.

5.4 Mechanical properties test

5.4.1 Test base metal

The base material for the test of mechanical properties of deposited metal shall be a steel plate equivalent to the chemical composition of the deposited metal. If other base metals are used, they should be

The test layer is used to weld the separation layer on the groove surface and the surface of the pad, and the thickness thereof is not less than 3 mm after processing.

5.4.2 Preparation of test pieces

5.4.2.1 The mechanical properties of deposited metal are prepared according to GB/T 25774.1, using test piece type 1.3, the test plate width is not less than 125mm,

For welding, Phi1.2mm welding wire is used, or other specifications are agreed by the supplier and the buyer. Welding parameters are recommended by the manufacturer. Test piece preparation

The welding heat input, number of passes and number of layers shall be as specified in Table 8.

5.4.2.2 After the positioning of the test plate, the temperature of the test plate shall reach the specified preheating temperature during the welding, and the temperature between the channels shall be maintained during the welding process.

6. When the test plate temperature exceeds, it should be cooled naturally. Preheating temperature and surface temperature measurement according to GB/T 18591 using a surface thermometer, thermometer or thermocouple

The temperature between the roads.

5.4.2.3 When the test piece requires post-weld heat treatment, it shall be carried out before the processing of the tensile specimen. The heat treatment conditions shall be as specified in Table 6. The test piece is placed in the furnace

When inside, the furnace temperature should not be higher than 315 ° C, from 315 ° C, to a specified temperature at a rate of not more than 280 ° C/h. Reaching the holding time

Thereafter, it is cooled with the furnace at a rate of not more than 195 ° C/h, and is allowed to be taken out of the furnace after being lower than 315 ° C, and naturally cooled to room temperature. Also available under

It is necessary for both parties to agree to adopt other heat treatment specifications.

5.4.3 Tensile test

The size and sampling position of the deposited metal tensile specimen are in accordance with GB/T 25774.1, and the tensile test is carried out according to GB/T 2652.

5.5 Radiographic test

5.5.1 Weld ray flaw detection test shall be carried out before the interception of the mechanical specimen. The bolster shall be removed before the ray flaw detection.

5.5.2 Weld flaw detection test shall be carried out according to GB/T 3323.

5.5.3 When assessing the weld ray flaw detection film, 25mm at both ends of the test piece shall be disregarded.

5.6 Deposited metal diffusion hydrogen test

The diffusion hydrogen content of the deposited metal is determined according to GB/T 3965. See Appendix G for instructions on diffusible hydrogen.

Table 8 Recommended welding heat input, number of rows and layers

Wire diameter

Mm

Average heat input

kJ/mm

Number of tracks per layer

The first layer of the first layer a

Number of layers

<=0.8, 0.9 0.8~1.4 1 or 2 2 or 3 6~9

1.0, 1.2 1.0~2.0 1 or 2 2 or 3 6~9

1.4, 1.6 1.0~2.2 1 or 2 2 or 3 5~8

1.8, 2.0 1.4~2.6 1 or 2 2 or 3 5~8

2.4 1.6~2.6 1 or 2 2 or 3 4~8

2.8 2.0~2.8 1 or 2 2 or 3 4~7

3.2 2.2~3.0 1 or 2 2 4~7

4.0 2.6~3.3 1 2 4~7

a The last layer can be completed by 4 channels.