[기계적 성질]
1. 철근 Steel Bars For Concrete Reinforcement
(KS D 3504)
종류의 기호
Symbol
인장시험
Tensile Test
굽힘시험
Bend Test
항복점
Yield point
or yield
Strength
N/㎟
인장강도
Tensile
Strength
N/㎟
연산율
Elongation
굽힘각도
Bendiong
Angle
N/㎟
안쪽반지름
Inside Radius
of Bending
N/㎟
시험관
Test Piece
Min. %
SR 240
240 min.
380 min.
No. 2
20
180˚
1.5d
No. 3
24
SR 300
300 min.
440 min.
No. 2
18
180˚
D16 & under
1.5d
No. 3
20
Over D16
2.0d
SD 300
300 min.
440 min.
No. 2 or equivalent
16
180˚
D16 & under
1.5d
No. 3 or equivalent
18
Over D16
2.0d
SD 350
350 min.
490 min.
No. 2 or equivalent
18
180˚
D16 & under
1.5d
No. 3 or equivalent
20
Over D16
D41 incl
2.0d
D51
2.5d
SD 400
400 min.
560 min.
No. 2 or equivalent
16
180˚
2.5d
No. 3 or equivalent
18
SD 500
500 min.
620 min.
No. 2 or equivalent
12
90˚
D25 & under
2.5d
No. 3 or equivalent
14
Over D25
3.0d
SD 400W
400 min.
560 min.
No. 2 or equivalent
16
180˚
2.5d
No. 3 or equivalent
18
SD 500W
500 min.
620 min.
No. 2 or equivalent
12
90˚
D25 & under
2.5d
No. 3 or equivalent
14
Over D25
3.0d