UNS S17400 Precipitation Hardening Stainless Steel , Special Alloys For Jet Engines

Precipitation hardening stainless steel UNS S17400, 17-4PH, AISI 630 for jet engines and land vehicle structures

PRODUCT

Precipitation hardening stainless steel UNS S17400, 17-4PH, AISI 630 for jet engines and land vehicle structures, etc.

EQUIVALENT DESIGNATION

0Cr17Ni4Cu4Nb, 17-4PH, AISI 630, SUS 630, W.Nr. 1.4542, X5CrNiCuNb16-4

PRODUCT FORM

Product available in bar (round, flat, hexagon, square, section), wire, forgings, tube, ring, plate, sheet and strip, etc. In all forms, the material is furnished in annealed condition.

OVERVIEW

S17400 is a chromium-nickel-copper precipitation hardening martensitic stainless steel used for applications requiring high strength and hardness along with a moderate level of corrosion resistance. High strength is maintained to approximately 600℉ (316℃). This alloy is designated Grade or Type 630 in several specifications.

S17400 alloy is martensitic in structure in the annealed condition and is further strengthened by a low temperature treatment which precipitates a copper containing phase in the alloy. In comparison to many alloys in the precipitation hardening family, the S17400 alloy requires a simple heat treatment; a one step process conducted at a temperature in the range 900℉ (482℃) to 1150℉(621℃) depending on the combination of strength and toughness desired. A wide range of properties can be produced by this one step heat treatment. Heat treatment in the 900℉ (482℃) range produces highest strength, although slightly less than that of alloys like S17700 or S15700. The latter precipitation hardening stainless steels generally require more steps to complete heat treatment.

APPLICATION

Offshore platform, helicopter deck other platforms

Food processing

Pulp and paper industry

Aerospace (Aircraft and gas turbine blade)

Mechanical components

Nuclear reactor

Oil field

Chemical process components

General metalworking industry

CHEMICAL COMPOSITION (wt%):

PHYSICAL PROPERTY

Melting point:1400-1440℃

Density: 7.75g/cm³

CORROSION RESISTANCE

S17400 alloy has superior corrosion resistance to any other standard hardened stainless steel.

Tests have shown that the corrosion resistance of S17400l is comparable to that of Type 304 stainless steel in most media. In general, the corrosion resistance of S17400 alloy is superior to that of the hardenable 400 series stainless steels. As with other precipitation hardening stainless steels, S17400 is more susceptible to stress corrosion cracking at peak strength. Consequently, in applications where chloride stress corrosion cracking is a possibility, the material should be precipitation hardened to produce the lowest hardness compatible with the intended end use. This is done by heat treating at the highest temperature which will produce suitable minimum properties.

Material in the annealed condition should not generally be put into service. In this condition, the material has an untempered martensite structure and is less ductile than aged material. The untempered martensite may be subject to unpredictable brittle fractures. In corrosive environments, the untempered martensite is more sensitive to embrittling phenomena such as hydrogen embrittlement than material that has had one of the precipitation hardening heat treatments. Similarly, untempered martensite is more sensitive to chloride stress corrosion cracking than material in which the martensite has been tempered.

This alloy is susceptible to corrosion or crack corrosion in static seawater

It has the same resistance to corrosion in the petrochemicalm, food processing and paper industry as the 304L grade.

MECHANICAL PROPERTIES

Room temperature tensile properties can vary substantially with heat treatment in the 900℉(482℃) to 1150℉(621℃) range. Values shown below are typical room temperature properties that may be expected for various precipitation hardening heat treatments as well as for the 1950℉(1066℃) solution heat treatment.

HEAT TREATMENT

Solution heat treatment

Heat treat to produce martensitic structure, solution heat treatment shall be soaked at 1900-1950℉(1038-1066℃) for 30 min and followed cooling rapidly below 16℃ (60℉) for complete martensite transformation.

Precipitation heat treatment

Precipitation heat treatment to produce desired strength as table below

FORMABILITY

The tensile data for the S17400 precipitation hardening stainless steel indicate that the alloy does not possess the high tensile elongation characteristic of the austenitic stainless steels. The material is capable of being mildly formed but is not capable of being severely formed. Forming is more easily accomplished in the overaged (such as H1150-M from SA693) condition than in the annealed condition.

FORGING

S17400 stainless steel is forged at 1010℃(1850℉). Before performing this process, it is soaked at 1177℃(2150℉). Post-work solution treatment should be performed before final hardening.

HOT WORKING

S17400 stainless steel can be hot worked using common processes. It is treated at 1038℃(1900℉). Post-work solution treatment should be performed before final hardening.

COLD WORKING

S17400 stainless steel can be cold worked using common techniques in spite of its high initial yield strength.

STANDARD SPECIFICATION

AMS 5342 / AMS 5343 / AMS 5344 / AMS 5355 Corrosion resistant steel, Investment Castings

AMS 5604 Sheet, Strip and Plate

AMS 5622 Steel Bars, Wire, Forgings, Tubing, and Rings

AMS 5643 Bars, Forgings, Tubing and Rings

AMS 5825 Steel, Corrosion-Resistant, Welding Wire 16.4Cr - 4.8Ni - 0.22Cb(Nb) - 3.6Cu

AMS 5827 Welding Electrodes

AMS 7474 Bolts

ASTM A564 / ASTM SA564 Bars, Wire and Shapes

ASTM A693 / ASME SA693 Sheet, Plate and Strip

ASTM A705 / ASME SA705 Forgings

SAE J467(17-4PH) Special Purpose Alloys ("Superalloys")

MIL-S-81506

MIL-C-24111

MIL-P-47183

MIL-S-81591 Military specification: steel, investment castings

EN 10088-3 Semi-finished product, bar, rod, wire, section and bright bar.

EN 10250-4 Open die stainless steel forgings for general engineering purpose

GB/T 1220 Stainless steel bar

GJB 2294 Specification for stainless and heat resisting steel bar for aviation

COMPETITIVE ADVANTAGE:

More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Hundreds of patent technologies.
(4) Our defense serves the needs of government defense departments, defense contractors and fabricators in the China and allied countries with an unsurpassed array of specialty materials and armor products, engineering, and technical services. Our products and services are used for many critical land-based vehicle applications.

DESCRIPTION:

BUSINESS TERM

With background of more than 50 years of material R&D experience, CMMC is a high-tech enterprise specialized in production of high temperature alloys, corrosion resistant alloys, precision alloys, wear resistant alloys, refractory alloys and other special alloys.

With main smelting equipments by CONSARC, including vacuum induction melting furnace (VIM 3 metric tons x 1 set), inert gas protective electric slag remelting furnace (IG-ESR 5 metric tons x 1 set, 10 metric tons x 2 sets), vacuum arc remelting furnace (VAR 10 metric tons x 1 set), CMMC has an annual production capacity of 3000 metric tons.

Established in 2016, CMMC stll having an investing plan of more than 30 million U.S.Dollars in the coming 5 years. CMMC aspires to become an internationally renowned supplier and leading brand of key materials for core components of high-end equipments in the application fields of aerospace, clean energy, petroleum, chemical engineering, medical, marine engineering, food and automobile, etc.

Our main products include forgings, bars, rods, tubulars, plates, sheets, strips, wire rods, precision wires, etc.

From ultra-pure smelting, hot and cold forming, heat treatment, mechanical processing to finish machining, CMMC provides the whole process of one-stop professional services.

From demand idea to research and development, from technology innovation to promoting of products upgrading, from customer's puzzles and difficulties to final solution, from smelting to market, no matter wherever, whenever, whatever and however, CMMC always try to provide satisfactory one-stop service.

By providing better materials to make a better world, CMMC never give up the dream.