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ASTM A860 

百人牛牛系统有什么规律 www.rfcdk.com ASTM A860 – Wrought High-Strength Low-Alloy Steel Butt-Welding Fittings

Grade: WPHY42  WPHY46  WPHY52  WPHY60  WPHY65  WPHY70

Chemical Compositions (max, %) Heat analysis

C

Mn

P

S

Si

Ni

Cr

Mo

Cu

Ti

V

Cb

V+Cb

Ti

0.20

1.00-1.45

0.030

0.010

0.15-0.40

0.50

0.30

0.25

0.35

0.05

0.10

0.04

0.12

0.06

1.The carbon equivalent as calculated by the follwing formula, shall not exceed 0.42%:CE=C+Mn/6+(Cr+Mo+V)/5+(Ni+Co)/15.

2.If vacuum carbon deoxidation is used, silicon chall not exceed 0.10% by heat analysis and 0.12% by product analysis.1.The carbon equivalent as calculated by the follwing formula, shall not exceed 0.42%:CE=C+Mn/6+(Cr+Mo+V)/5+(Ni+Co)/15.

3.The sum of Ni+Cr+Mo+Cu shall not exceed 1.0%. 

Mechanical Requirements

Property

Grade

WPHY

 42

WPHY

46

 WPHY

 52

WPHY

 60

WPHY

 65

WPHY

70

Yield strength, minA 0.2 % offset, ksi [MPa]

42 [290]

46 [315]

52 [360]

60 [415]

65 [450]

70 [485]

Tensile strength, ksi [Mpa]

60 [415]

-85 [585]

63[435]-

88 [605]

66[455]- 91 [625]

75[515]-

100 [690]

77[530]- 102 [705]

80[550]-

105 [725]

Elongation:
Standard round specimen, or small-size proportional specimen, min, % in 4D

25

25

25

20

20

20

Rectangular specimen, for section thickness 5?16 in. [7.94mm] and over, and for all small sizes tested in full section; min, % in 2 in. [50 mm].

32

32

32

28

28

28

Rectangular specimen for thickness less than 5?16 in. [7.94mm]; min, % 2 in. [50 mm]. Width of specimen 11?2 in. [40mm].

B

B

B

B

B

B

Toughness: Cv energy absorption C; measured at ?50°F [?46°C].

Size, mm

Average/min, ft·lbs[J]

Lateral Expansion min, MLS[mm]

10 × 10

30/25 [40/34]

25 [0.64]

10 × 7.5

25/21 [34/28]

21 [0.53]

10 × 5

20/17 [27/23]

13 [0.33]

A) Actual yield strength shall not exceed specified minimum by more than 15 ksi [105 MPa].

B) For each 1?32-in. [0.79 mm] decrease in section thickness below 5?16 in. [7.94 mm], a deduction of 1.5 % from the elongation value of specimens above 5?16 in. [7.94mm] is permitted. When the section thickness lies between two values defined above, the minimum elongation value is determined by the following equation: E = 48t + 15.00

where: E = elongation % in 2 in. [50 mm], and t = actual thickness of specimen

C) These requirements are intended to minimize fracture initiation. The requirements are not intended to give assurance against fracture propagation.

Hardness Requirements

Fittings shall have a maximum hardness of 22 HRC (235 HB).