This specification covers for several grades of carbon and alloy
steel mechanical tubing, either hot-finished or cold-finished.  The
steel used in the mechanical tubing may be cast in ingots or may be
strand cast.  When steel of different grades is sequentially strand
cast, identification of the resultant transition material is
required.  The seamless tubing is a tubular product made without a
welded seam.  It is usually manufactured by hot working steel, and
if necessary, by subsequently cold finishing the hot-worked tubular
product to produce the desired shape, dimensions and properties. 
The tubes shall be furnished in the following shapes: round,
square, rectangular and special sections.  Heat analysis shall be
made to determine the percentages of the elements specified.  If
secondary melting processes are used, the heat analysis shall be
obtained from one remelted ingot or the product of one remelted
ingot of each primary melt.  The tubing shall be coated with a film
of oil before shaping to retard rust when specifiedThis abstract is a brief summary of the referenced standard.  It is
informational only and not an official part of the standard; the
full text of the standard itself must be referred to for its use
and application.  ASTM does not give any warranty express or implied
or make any representation that the contents of this abstract are
accurate, complete or up to date. 

Grade and Chemical Composition (%) of ASTM A519:

Grade

C

Mn

P≤

S≤

Si

Cr

Mo

ASTM A519 1008

≤0.10

0.30-0.50

0.04

0.05

-

-

-

ASTM A519 1010

0.08-0.13

0.30-0.60

0.04

0.05

-

-

-

ASTM A519 1015

0.13-0.18

0.30-0.60

0.04

0.05

ASTM A519 1018

0.15-0.20

0.60-0.90

0.04

0.05

-

-

-

ASTM A519 1020

0.18-0.23

0.30-0.60

0.04

0.05

-

-

-

ASTM A519 1025

0.22-0.28

0.30-0.60

0.04

0.05

-

-

-

ASTM A519 1035

0.32-0.38

0.60-0.90

0.04

0.05

ASTM A519 1045

0.43-0.50

0.60-0.90

0.04

0.05

ASTM A519 1026

0.22-0.28

0.60-0.90

0.04

0.05

-

-

-

ASTM A519 4130

0.28-0.33

0.40-0.60

0.04

0.04

0.15-0.35

0.80-1.10

0.15-0.25

ASTM A519 4140

0.38-0.43

0.75-1.00

0.04

0.04

0.15-0.35

0.80-1.10

0.15-0.25

Mechanical Properties of ASTM A519:

Grade

Condition

Ultimate Strength

Yield Strength

Elongation

Rockwell Hardness

Ksi

Mpa

Ksi

Mpa

%

B scale

ASTM A519 1020

HR

50

345

32

221

25

55

CW

70

483

60

414

5

75

SR

65

448

50

345

10

72

A

48

331

28

193

30

50

N

55

379

34

234

22

60

ASTM A519 1025

HR

55

379

35

241

25

60

CW

75

517

65

448

5

80

SR

70

483

55

379

8

75

A

53

365

30

207

25

57

N

55

379

36

248

22

60

ASTM A519 1035

HR

65

448

40

276

20

72

CW

85

586

75

517

5

88

SR

75

517

65

448

8

80

A

60

414

33

228

25

67

N

65

448

40

276

20

72

ASTM A519 1045

HR

75

517

45

310

15

80

CW

90

621

80

552

5

90

SR

80

552

70

483

8

85

A

65

448

35

241

20

72

N

75

517

48

331

15

80

ASTM A519 4130

HR

90

621

70

483

20

89

SR

105

724

85

586

10

95

A

75

517

55

379

30

81

N

90

621

60

414

20

89

ASTM A519 4140

HR

120

855

90

310

15

100

SR

120

855

100

689

10

100

A

80

552

60

414

25

85

N

120

855

90

621

20

100

Tube Designation:

Designation

Symbol

Description

Cold finished (hard)

BK

Tubes do not undergo heat treatment following the final cold
forming and, thus, have a rather high resistance to deformation. 

Cold finished (soft)

BKW

The final heat treatment is followed by cold drawing involving
limited deformation.  Appropriate further processing allows a
certain degree of cold forming. ( e.g. bending, expanding). 

Cold finished and stress-relieved

BKS

Heat treatment is applied following the last cold forming process. 
Subject to appropriate processing conditions, the increase in the
residual stresses involved enables both forming and machining to a
certain degree. 

Annealed

GBK

The last cold forming process is followed by annealing in a
controlled atmosphere. 

Normalized

NBK

The last cold forming process is followed by annealing above the
upper transformation point in a controlled atmosphere. 

Applications:

ASTM A519 For mechanical engineering, For mechanical and pressure
use,and also for transporting steam,water,gas and etc

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