QUY CCH MU TH KO, UN, VA P

ASTM A370

TENSILE TEST

NOTE 5For each of the three sizes of specimens, narrower widths (W and C) may be used when

necessary. In such cases the width of the reduced section should be as large as the width of the material

being tested permits; however, unless stated specifically, the requirements for elongation in aproduct

specification shall not apply when these narrower specimens are used. If the width of the material is less

thanW, the sides may be parallel throughout the length of the specimen

NOTE 4For each specimen type, the radii of all fillets shall be equal to each other with a tolerance of 0.05

in. (1.25 mm), and the centers of curvature of the two fillets at a particular end shall be located across from

each other (on a line perpendicular to the centerline) within a tolerance of 0.10 in. (2.5mm).

NOTE 7The dimension T is the thickness of the test specimen as provided for in the applicable material

specifications. Minimum nominal thickness of (40-mm) wide specimens shall be (5 mm), except as

permitted by the product specification. Maximum nominal thickness of (12.5-mm) and (6.25-mm) wide

specimens shall be (19 mm) and (6 mm), respectively.

- Plate-type chiu dy ti thiu l 5mm

- Sheet-type v subsize: chiu dy ln nht l 19mm (rng 12.5) v 6mm (rng 6.25)

Plate-Type Specimen

This specimen is used for testing metallic materials in the form of plate, structural and bar-size shapes, and

flat material having a nominal thickness of 316in. (5 mm) or over. When product specifications so permit,

other types of specimens may be used

Sheet-Type Specimen

This specimen is used for testing metallic materials in the form of sheet, plate, flat wire, strip, band, and

hoop ranging in nominal thickness from 0.005 to 3 4in. (0.13 to 19 mm).

Metric equivalent: 1 in. = 25.4 mm.

IMPACT TEST

BEND TEST-ASTM E190, E290

Transverse Side Bend (uon canh)The weld is transverse to the longitudinal axis of the specimen which is

bent so that either one of the side surfaces becomes the convex surface of the bent specimen

Transverse Face Bend (uon mat)The weld is transverse to the longitudinal axis of the specimen which is

bent so that the weld face surface becomes the convex surface of the bent specimen

Transverse Root Bend (uon chan)The weld is transverse to the longitudinal axis of the specimen which

is bent so that the weld-root surface becomes the convex surface of the bent specimen

Quy nh chy ci un

Mu un cnh

- Nu mu c ct bng hi th phi gia cng phay cch mp ti thiu 1/8 (3.1mm)

- Nu mu dy (9.5-38mm), th b rng ct bng chiu dy mu

- Nu mu dy ln hn 38mm th chiu rng mu t 19 n 38mm

Un mt v chn (tm v ng)

NOTE 118in. = 3.2 mm; 1 12in. = 38 mm; 6 in. = 152 mm.

NOTE 2Weld reinforcement and backing strip or backing ring, if any, shall be removed flush with

the surface of the specimen. The specimen shall be machined to a thickness,T, which must be specified

in relation to t. If a recessed ring is used, this surface of the specimen may be machined to a depth not

exceeding the depth of the recess to remove the ring, except that in such cases the thickness of the finished

specimen shall meet the specified relationship to t. Do not flame-cut nonferrous material. When the

original wall thickness of pipe exceeds 38 in. (9.5 mm), excess material shall be machined from the inside

surface of face-bend specimens and the outside surface of root-bend specimens. For Boiler Code nonferrous

materials, see Table QN-8, Section IX on Welding Qualifications of the ASME Boiler and Pressure Vessel

Code, 1965.

- Mu gia cng tng t mu un cnh. Nu ct hi phi mi i ti thiu 3mm

- B rng mu l 38mm, chiu du 152mm, cc cnh vt mp 3mm. Mu ng c mi thnh mu

ch nht kch thc tng t mu tm

- Chiu dy gia cng mi hn phi c mi bng vi tn c bn

Quy cch mu th ko theo TCVN 197 : 2002/ISO 6892-1/ EN 10002-1

. Loi mu th dng cho tm, bng c chiu dy bng hoc ln hn 3 mm, v cho dy, thanh, thp

hnh c ng knh hoc chiu dy bng hoc ln hn 4 mm

k ng knh

d

mm

Din tch mt ct

ngang ban u

So

mm2

Chiu di c ban u

Lo = k oS

mm

Chiu di phn song song nh

nht

Lc

mm

Chiu di tng

Lt

mm

5,65 20 0,15

10 0,075

5 0,040

314

78,5

19,6

100 1

50 0,5

25 0,25

110

55

28

Trn nguyn tc

Lt > Lc + 2d hoc 4d

ASME IX nh gi th hn

Cc php kim tra

1. Th ko QW150

2. Th un QW160

3. Th mi hn gc QW180

4. dai rnh kha- va p QW 171, QW172

I. Th ko

QW-151.1 Reduced Section Plate.

Reduced-section specimens conforming to the requirements given in figure QW-462.1(a) may be

used for tension tests on all thicknesses of plate.

(a) For thicknesses up to and including 1 in. (25 mm), a full thickness specimen shall be

used for each required tension test.

(b) For plate thickness greater than 1 in. (25 mm), full thickness specimens or multiple

specimens may be used, provided QW-151.1(c) and QW-151.1(d) are complied

with.

(c) When multiple specimens are used, in lieu of full thickness specimens, each set shall

represent a single tension test of the full plate thickness. Collectively, all of the specimens

required to represent the full thickness of the weld at one location shall comprise a set.

(d) When multiple specimens are necessary, the entire thickness shall be mechanically cut into a

minimum number of approximately equal strips of a size that can be tested in the available

equipment. Each specimen of the set shall be tested and meet the requirements of QW-153.

Reduced Section Pipe.

Reduced-section specimens conforming to the requirements given in figure QW-462.1(b) may be

used for tension tests on all thicknesses of pipe having an outside diameter greater than 3 in.

(75 mm).

(a) For thicknesses up to and including 1 in. (25 mm), a full thickness specimen shall be

used for each required tension test.

(b) For pipe thicknesses greater than 1 in. (25 mm), full thickness specimens or multiple

specimens may be used, provided QW-151.2(c) and QW-151.2(d) are complied

with.

(c) When multiple specimens are used, in lieu of full thickness specimens, each set shall

represent a single tension test of the full pipe thickness. Collectively, all of th specimens required

to represent the full thickness of the weld at one location shall comprise a set.

Acceptance Criteria Tension Tests

Tensile Strength.Minimum values for procedure qualification are provided under the column

heading Minimum Specified Tensile, ksi of table QW/QB-422.

In order to pass the tension test, the specimen shall have a tensile strength that is not less than

(a) the minimum specified tensile strength of the base metal; or

(b) the minimum specified tensile strength of the weaker of the two, if base metals of different

minimum tensile strengths are used; or

(c) the minimum specified tensile strength of the weld metal when the applicable Section

provides for the use of weld metal having lower room temperature strength than the base metal;

(d) if the specimen breaks in the base metal outside of the weld or weld interface, the test

shall be accepted as meeting the requirements, provided the strength is not more than 5%

below the minimum specified tensile strength of the base metal.

Mu tm

T= coupon thickness excluding reinforcement

W=specimen width,3/4 in. (19 mm)

X=coupon thickness including reinforcement

Y= specimen thickness

Quy cch mu : (di 250)x (dy mu) x (rng 19mm) x (6+6+weld face) x (gc ln 25)

MU NG

Quy cch mu : (di 250)x (dy mu- mi phng) x (rng 19mm) x (6+6+weld face) x (gc ln 25)

Mu un cnh