SAE AMS 5790F-2025 高铁素体级20Cr-10Ni-0.75Cb（347）耐腐蚀和耐热钢焊丝（成分类似于UNS S34780）

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For more information on this standard, visit

https://www.sae.org/standards/content/AMS5790F/

AEROSPACE

MATERIAL SPECIFICATION

AMS5790™

REV. F

Issued 1984-10

Reaffirmed 2008-05

Revised 2025-09

Superseding AMS5790E

Steel, Corrosion- and Heat-Resistant, Welding Wire,

20Cr - 10Ni - 0.75Cb (347),

High Ferrite Grade

(Composition similar to UNS S34780)

RATIONALE

AMS5790F is the result of a Five-Year Review and update of the specification. The revision is updated to include the trade

name (see Title and 8.5), address reporting of composition (see 3.1.2), and update the marking/exceptions requirements

(see 8.4).

1. SCOPE

1.1 Form

This specification covers a corrosion- and heat-resistant steel in the form of welding wire.

1.2 Application

This wire has been used typically as filler metal for gas-tungsten-arc or gas-metal-arc welding of corrosion- and

heat-resistant alloys of similar composition, but usage is not limited to such applications.

1.2.1 The relatively high ferrite content promotes weldability by combating micro-fissuring and minimizing cracking in

heavy sections but limits use of the wire to applications not operating in the sigma-forming temperature range, which

is approximately 1100 to 1600 °F (590 to 870 °C).

2. APPLICABLE DOCUMENTS

The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the

extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is

specified. When the referenced document has been cancelled and no superseding document has been specified, the last

published issue of that document shall apply.

SAE INTERNATIONAL AMS5790™F Page 2 of 7

2.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (U.S. and

Canada only) or +1 724-776-4970 (outside U.S. and Canada), www.sae.org.

AMS2248 Chemical Check Analysis Limits, Corrosion- and Heat-Resistant Steels and Alloys, Maraging and Other

Highly Alloyed Steels, and Iron Alloys

AMS2371 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steels and Alloys, Wrought

Products and Forging Stock

AMS2813 Packaging and Marking of Packages of Welding Wire, Standard Method

AMS2814 Packaging and Marking of Packages of Welding Wire, Premium Quality

AMS2816 Identification, Welding Wire, Tab Marking Method

AMS2819 Identification, Welding Wire, Direct Color Code System

ARP1876 Weldability Test for Weld Filler Metal Wire

ARP4926 Alloy Verification and Chemical Composition, Inspection of Welding Wire

AS7766 Terms Used in Aerospace Metals Specifications

HS-1086 Metals and Alloys in the Unified Numbering System

2.2 ASTM Publications

Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,

Tel: 610-832-9585, www.astm.org.

ASTM A751 Chemical Analysis of Steel Products

2.3 AWS Publications

Available from American Welding Society, 8669 NW 36 Street, #130, Miami, FL 33166-6672, Tel: 1-800-443-9353 or

305-443-9353, www.aws.org.

DeLong, W.T. (1974). Ferrite in Austenitic Stainless Steel Weld Metal. Welding Journal 53(7), 273-s to 286-s.

2.4 Definitions

Terms used in AMS are defined in AS7766.

3. TECHNICAL REQUIREMENTS

3.1 Wire Composition

Composition shall conform to the percentages by weight shown in Table 1, determined in accordance with ASTM A751 or

by other analytical methods acceptable to the purchaser.

SAE INTERNATIONAL AMS5790™F Page 3 of 7

Table 1 - Composition

Element

Min

Max

Carbon (see 3.1.1.1)

0.05

Manganese

1.00

2.50

Silicon

0.30

0.65

Phosphorus

0.015

Sulfur

0.015

Chromium

18.50

21.00

Nickel

9.00

11.00

Columbium (Niobium)

10xC

0.80

Molybdenum

0.75

Tantalum

0.05

Copper

0.50

Nitrogen (see 3.1.1.1)

0.006 (60 ppm)

3.1.1 Chemical analysis of initial bar or rod stock before drawing is acceptable provided processes used for drawing or

rolling, annealing, and cleaning are controlled to ensure continued conformance to composition requirements.

3.1.1.1 Carbon and nitrogen shall also be determined periodically on finished wire (see 4.2.2).

3.1.2 The producer may test for any element not listed in Table 1 and include this analysis in the report of 4.4. Reporting

of any element not listed in the composition table is not a basis for rejection unless limits of acceptability are

specified by the purchaser.

3.1.3 Check Analysis

Composition variations shall meet the applicable requirements of AMS2248.

3.1.4 Ferrite Control

Ferrite number of the wire shall be not less than 5.0, based on the calculated ferrite content from the DeLong diagram

(refer to DeLong, 1974).

3.2 Condition

Wire shall be cold worked, bright finish, in a temper and with a surface finish that will provide proper feeding of the wire in

machine welding equipment.

3.3 Fabrication

3.3.1 Wire shall be formed from rod or bar descaled by a process that does not affect the composition of the wire. Surface

irregularities inherent with a forming process that does not tear the wire surfaces are acceptable provided the wire

conforms to the tolerances of 3.6.

3.3.2 Butt welding is permissible provided both ends to be joined are alloy verified using a method capable of

distinguishing the alloy from all other alloys processed within the facility, or the repair is made at the wire processing

station. The butt weld shall not interfere with uniform, uninterrupted feeding of the wire in machine

welding equipment.

3.3.3 In-process annealing, if required between cold-rolling or drawing operations, shall be performed in vacuum or in

protective atmosphere to ensure freedom from surface oxidation and absorption of other extraneous elements.

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SAE AMS 5790F-2025 高铁素体级20Cr-10Ni-0.75Cb（347）耐腐蚀和耐热钢焊丝（成分类似于UNS S34780）

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