RWMA Minimum Physical Properties

Reference Standard: AWS J1.3/J1.3M:2020-AMD1 - Specification for Materials Used in Resistance Welding Electrodes and Related Equipment (Table 5)

SIZE RANGE	ROCKWELL HARDNESS	CONDUCTIVITY % IACS	YIELD STRENGTH ksi	TENSILE STRENGTH ksi	ELONGATION % (2" or 4D)
Up to 1"	Up to 25	65 HRB	75 HRB	90 HRB	80%	75%	45%	45	45	55	60	65	95	13%	13%	9%
>1" to 2"	>25 to 51	60 HRB	70 HRB	90 HRB	80%	75%	45%	45	45	55	55	59	92	14%	13%	9%
>2" to 3"	>51 to 76	55 HRB	65 HRB	90 HRB	80%	75%	45%	45	45	55	50	55	88	15%	13%	9%

SIZE RANGE

ROCKWELL HARDNESS

CONDUCTIVITY % IACS

YIELD STRENGTH ksi

TENSILE STRENGTH ksi

ELONGATION % (2" or 4D)

in.

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Up to 1"

Up to 25

65 HRB

75 HRB

90 HRB

80%

75%

45%

13%

>1" to 2"

>25 to 51

60 HRB

70 HRB

90 HRB

80%

75%

45%

14%

13%

>2" to 3"

>51 to 76

55 HRB

65 HRB

90 HRB

80%

75%

45%

15%

13%

GROUP A - COPPER BASE ALLOYS: SQUARE, RECTANGULAR, AND HEXAGONAL BAR (COLD WORKED)

THICKNESS	ROCKWELL HARDNESS	CONDUCTIVITY % IACS	YIELD STRENGTH ksi	TENSILE STRENGTH ksi	ELONGATION % (2" or 4D)
Up to 1"	Up to 25	55 HRB	70 HRB	90 HRB	80%	75%	45%	45	45	60	60	65	95	13%	13%	9%
>1"	>25	50 HRB	65 HRB	90 HRB	80%	75%	45%	45	40	50	55	55	90	14%	14%	9%

THICKNESS

ROCKWELL HARDNESS

CONDUCTIVITY % IACS

YIELD STRENGTH ksi

TENSILE STRENGTH ksi

ELONGATION % (2" or 4D)

in.

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Up to 1"

Up to 25

55 HRB

70 HRB

90 HRB

80%

75%

45%

13%

>1"

>25

50 HRB

65 HRB

90 HRB

80%

75%

45%

14%

THICKNESS	ROCKWELL HARDNESS	CONDUCTIVITY % IACS	YIELD STRENGTH ksi	TENSILE STRENGTH ksi	ELONGATION % (2" or 4D)
Up to 1"	Up to 25	55 HRB	65 HRB	90 HRB	80%	75%	45%	45	45	50	60	55	94	12%	13%	9%
>1" to 2"	>25 to 51	50 HRB	65 HRB	90 HRB	80%	75%	45%	45	45	50	55	55	90	13%	13%	9%
>2"	>51	50 HRB	65 HRB	90 HRB	80%	75%	45%	45	40	50	55	55	88	13%	13%	9%

THICKNESS

ROCKWELL HARDNESS

CONDUCTIVITY % IACS

YIELD STRENGTH ksi

TENSILE STRENGTH ksi

ELONGATION % (2" or 4D)

in.

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Up to 1"

Up to 25

55 HRB

65 HRB

90 HRB

80%

75%

45%

12%

13%

>1" to 2"

>25 to 51

50 HRB

65 HRB

90 HRB

80%

75%

45%

13%

>2"

>51

50 HRB

65 HRB

90 HRB

80%

75%

45%

13%

SIZE	ROCKWELL HARDNESS	CONDUCTIVITY % IACS	YIELD STRENGTH ksi	TENSILE STRENGTH ksi	ELONGATION % (2" or 4D)
ALL	55 HRB	90 HRB	N/A	70%	45%	N/A	20	45	N/A	45	75	N/A	N/A	12%	5%

SIZE

ROCKWELL HARDNESS

CONDUCTIVITY % IACS

YIELD STRENGTH ksi

TENSILE STRENGTH ksi

ELONGATION % (2" or 4D)

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

Class 1

Class 2

Class 3

ALL

55 HRB

90 HRB

N/A

70%

45%

N/A

12%

NOTES:
• All materials are in fully heat-treated condition unless otherwise specified.
• Round bar stock up to 1" (25 mm) diameter is fully heat-treated and cold worked.
• Values shown are MINIMUMS per AWS J1.3:2020-AMD1 Table 5.
• Class 4 (C17200 - Copper Beryllium) properties are specified in HRC hardness: 33 HRC min., 22% IACS min.

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