Реферат

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 specified

Область применения

1.1 This specification covers several grades of carbon and alloy steel seamless mechanical tubing. The grades are listed in Tables 1-3. When welding is used for joining the weldable mechanical tube grades, the welding procedure shall be suitable for the grade, the condition of the components, and the intended service.

TABLE 1 Chemical Requirements of Low-Carbon Steels

Grade Designation

Chemical Composition Limits, %

Carbon^A

Manganese^B

Phosphorous,^B
max

Sulfur,^B
max

 

 

 

 

 

MT 1010

0.05–0.15

0.30–0.60

0.040

0.050

MT 1015

0.10–0.20

0.30–0.60

0.040

0.050

MT X 1015

0.10–0.20

0.60–0.90

0.040

0.050

MT 1020

0.15–0.25

0.30–0.60

0.040

0.050

MT X 1020

0.15–0.25

0.70–1.00

0.040

0.050

(A) Limits apply to heat and product analyses.(B) Limits apply to heat analysis; except as required by 6.1, product analyses are subject to the applicable additional tolerances given in Table 5.

TABLE 2 Chemical Requirements of Other Carbon Steels

Grade Designation

Chemical Composition Limits, %^A

Carbon

Manganese

Phosphorous,
max

Sulfur,
max

 

 

 

 

 

1008

0.10 max

0.30–0.50

0.040

0.050

1010

0.08–0.13

0.30–0.60

0.040

0.050

1012

0.10–0.15

0.30–0.60

0.040

0.050

1015

0.13–0.18

0.30–0.60

0.040

0.050

1016

0.13–0.18

0.60–0.90

0.040

0.050

1017

0.15–0.20

0.30–0.60

0.040

0.050

1018

0.15–0.20

0.60–0.90

0.040

0.050

1019

0.15–0.20

0.70–1.00

0.040

0.050

1020

0.18–0.23

0.30–0.60

0.040

0.050

1021

0.18–0.23

0.60–0.90

0.040

0.050

1022

0.18–0.23

0.70–1.00

0.040

0.050

1025

0.22–0.28

0.30–0.60

0.040

0.050

1026

0.22–0.28

0.60–0.90

0.040

0.050

1030

0.28–0.34

0.60–0.90

0.040

0.050

1035

0.32–0.38

0.60–0.90

0.040

0.050

1040

0.37–0.44

0.60–0.90

0.040

0.050

1045

0.43–0.50

0.60–0.90

0.040

0.050

1050

0.48–0.55

0.60–0.90

0.040

0.050

1518

0.15–0.21

1.10–1.40

0.040

0.050

1524

0.19–0.25

1.35–1.65

0.040

0.050

1541

0.36–0.44

1.35–1.65

0.040

0.050

(A) The ranges and limits given in this table apply to heat analysis; except as required by 6.1, product analyses are subject to the applicable additional tolerances given in Table 5.

1.2 This specification covers both seamless hot-finished mechanical tubing and seamless cold-finished mechanical tubing in sizes up to and including 12 ³/₄ in. [325 mm] outside diameter for round tubes with wall thicknesses as required.

1.3 The tubes shall be furnished in the following shapes, as specified by the purchaser: round, square, rectangular, and special sections.

1.4 Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order.

1.5 The values stated in either SI units or inch-pound units are to be regarded separately as the standard. Within the text, the SI units are shown in brackets or parentheses. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order. In this specification hard or rationalized conversions apply to diameter, lengths and tensile properties. Soft conversion applies to other SI measurements.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.