Pipe and Tube, Nickel-Alloy ASTM B729

Category

Description

Pipe and Tube, Nickel-Alloy ASTM B729

Standard Specification for Seamless UNS N08020, UNS N08026, and UNS N08024 Nickel-Alloy Pipe and Tube
This standard is issued under the fixed designation B729; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.

Scope

This specification covers UNS N08020, UNS N08026, and UNS N08024 seamless, cold-worked or hot finished pipe and tube intended for general corrosive service.
The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
The following safety hazards caveat pertains only to the test methods portion, Section 10, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

Materials and Manufacture

The product of UNS N08020 alloy shall be furnished in the stabilized-annealed condition. The product of UNS N08026 alloy shall be furnished in the solution-annealed condition. The product of UNS N08024 alloy shall be furnished in the annealed condition.
NOTE 1—The recommended annealing temperatures all followed by quenching in water or rapidly cooling by other means are as follows: 1800 to 1850°F (982 to 1010°C) for UNS N08020, 2050 to 2200°F (1121 to 1204°C) for UNS N08026, and 1925 to 1975°F (1052 to 1079°C) for UNS N08024.

Chemical Composition

The material shall conform to the composition limits specified. One test is required for each lot as defined in Specification B829.
If a product analysis is performed by the purchaser, the material shall conform to the composition limits specified subject to the product analysis tolerances specified of Specification B829.

Element

Composition, %

UNS N08026

UNS N08020

UNS N08024

Carbon, max

0.03

0.07

0.03

Manganese, max

1.00

2.00

1.00

Phosphorus, max

0.03

0.045

0.035

Sulfur, max

0.03

0.035

Silicon, max

0.50

1.00

0.50

Nickel

33.00–37.20

32.00–38.00

35.00–40.00

Chromium

22.00–26.00

19.00–21.00

22.50–25.00

Molybdenum

5.00–6.70

2.00–3.00

3.50–5.00

Copper

2.00–4.00

3.00–4.00

0.50–1.50

Columbium (Nb) + tantalum

…

8 × carbon-1.00

0.15–0.35

Nitrogen

0.10–0.16

…

Iron

remainder^A

^A By difference.

Mechanical and Other Properties

Mechanical Properties—The material shall conform to the mechanical property requirements specified.
Hydrostatic or Nondestructive Electric Test—Each pipe and tube shall be subjected to either the hydrostatic test or the nondestructive electric test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.

Mechanical Property Requirements

Tensile Strength,min

Yield Strength,^A

Elongation in 2 in.(50.8 mm) or 4D min, %

ksi

Mpa

ksi

Mpa