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Tuesday 31 March 2020
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Alloy

UNS Number

Alloy 617

UNS N06617

 

GENERAL PROPERTIES

Alloy 617 is a solid-solution strengthened alloy, and has good oxidation resistance and a wide variety of corrosive media

Super alloys or high performance alloys have good creep and oxidation resistance. They have an ability to function under high temperatures and mechanical stress. They are available in different shapes, and contain a number of elements in a variety of combinations to achieve the desired result. There are three groups of alloys namely cobalt-based, nickel-based, and iron-based alloys. All the three types can be used at temperatures above 540°C (1000°F).

 

MACHINEABILITY

Alloy 617 is machined using conventional machining methods which are usually used for iron-based alloys. Machining operations are performed using commercial coolants. High-speed operations such as grinding, milling or turning, are performed using water-base coolants.

 

PHYSICAL PROPERTIES

Melting Point

(°C)

Density

Modulus of Elasticity
in Tension

1322 – 1380

  8.3g/cm3

211 GPa

 

MECHANICAL PROPERTIES

Alloy

Tensile Strength
Minimum
(psi)

Yield Strength
Minimum 0.2% offset

(psi)

% Elongation
in 2" Minimum

       

617

70,300

39,900

25

 

CHEMICAL PROPERTIES

Alloy

Cr

Fe

Co

Mo

S

Mn

Si

C

Al

Cu

B

Ni

617

20.0-24.0

3.0

10.0-15.0

8.0-10.0

0.015

1.0

1.0

0.05-0.15

0.8-1.5

0.5

0.006

Bal

 

WELDING

Alloy 617 is welded using gas-tungsten arc welding, shielded metal-arc welding, gas metal-arc welding, and submerged-arc welding methods.

 

HEAT TREATMENT

Alloy 617 is heat treated by annealing at 1177°C (2150°F) followed by quenching in water or cooling in air for thinner sections.

Alloy

UNS Number

Alloy X

UNS N06002

 

GENERAL PROPERTIES

Alloy X is a wrought nickel base alloy with excellent high temperature strength and oxidation resistance. All of the product forms are excellent in terms of forming and welding. Although Alloy X is primarily noted for heat and oxidation resistance it also has good resistance to chloride stress-corrosion cracking and has good resistance to carburization, excellent resistance to reducing or carburizing atmospheres. Alloy X is one of the most widely used nickel base superalloys for gas turbine engine components.

 

RESISTANCE TO CORROSION

The outstanding oxidation resistance of Alloy X is illustrated below. Tests were conducted by exposing samples to dry air at 1093°C. and to dry air pressurized to 300 psi at 954°C. Two criteria for evaluating oxidation resistance are weight change and depth of corrosion penetration. Alloy X excels in both respects due to the formation of a protective, tenacious oxide film.

 

PHYSICAL PROPERTIES

Melting Point

(°C)

Density

Specific Gravity

Modulus of Elasticity
in Tension

1260 – 1355

  8.22g/cm3

8.22

205 GPa

 

MECHANICAL PROPERTIES

Alloy

Tensile Strength
Minimum
(psi)

Yield Strength
Minimum 0.2% offset

(psi)

% Elongation
in 2" Minimum

       

X

95,000

35,000

35

 

CHEMICAL PROPERTIES

Alloy

C

Mn

Cr

Fe

Si

Mo

Co

B

Al

P

S

Ti

W

Cu

Ni

X

0.05-0.15

1.00

20.5-23.0

17.0-20.0

0.03

8.0-10.0

0.5-2.5

0.01

0.5

0.04

0.03

0.15

0.20-1.0

0.5

Bal

 

WELDING

Alloy X is readily welded by Gas Tungsten Arc Welding (GTAW), Gas Metal Arc

Welding (GMAW), Shielded Metal Arc Welding (SMAW), and resistance welding techniques.

Submerged Arc Welding (SAW) is not recommended as this process is characterized by high heat

Input to the base metal and slow cooling of the weld. These factors can increase weld restraint and promote cracking.

 

HEAT TREATMENT

All wrought forms of Alloy X are furnished in the solution heat-treated condition unless otherwise specified. The standard heat-treatment is at a temperature of 1177°C (2150°F) followed by rapid cooling. Other heat-treatment temperatures also may be effective for certain forms and conditions.

The properties listed here are average values based on laboratory test conducted by the manufacturer. They are indicative only of the results obtained in such tests and should not be considered as guaranteed maximums or minimums. Materials must be tested under actual service conditions to determine their suitability for a particular purpose. All data represent the average of six or less tests unless otherwise noted. All data shown for material aged for 1,000, 4,000, 8,000, and/or 16,000 hours are based on tests of a single heat. The secondary units (metric) used in this booklet are those of the SI system.

 

Alloy

UNS Number

Alloy G-3

UNS N06985

 

GENERAL PROPERTIES

Alloy G-3 is nickel-chromium-iron alloy with addition of molybdenum and copper. The alloy has excellent corrosion resistance to oxidizing chemicals and atmospheres while offering resistance to reducing chemical resulting from the nickel and copper content.

 

RESISTANCE TO CORROSION

Alloy G3 has excellent corrosion resistance to oxidizing chemicals and atmospheres while offering resistance to reducing chemicals resulting from the nickel and copper content. The high molybdenum provides very good resistance to pitting and crevice corrosion. The low carbon helps prevent sensitization, giving the alloy resistance to inter-granular corrosion.

 

PHYSICAL PROPERTIES

Melting Point

(°C)

Density

Modulus of Elasticity
in Tension

1260 - 1343

  8.14g/cm3

199 GPa

 

MECHANICAL PROPERTIES

Alloy

Tensile Strength
Minimum
(psi)

Yield Strength
Minimum 0.2% offset

(psi)

% Elongation
in 2" Minimum

       

G-3

90,000

35,000

45

 

CHEMICAL PROPERTIES

Alloy

C

Mn

Cr

Fe

Si

Mo

Co

P

S

Nb + Ta

W

Cu

Ni

G-3

0.015

1.0

21.0-23.5

18.0-21.0

1.0

6.0-8.0

5.0

0.04

0.03

0.5

1.5

1.5-2.5

Bal

 

WELDING

Welding of Alloy G3 alloy is performed through commonly used welding techniques like gas tungsten arc welding, shielded metal-arc welding, metal-arc welding and submerged-arc welding. However, an alloy filler metal that suits this alloy should be used.

 

HEAT TREATMENT

Alloy G3 may be annealed, but does not respond to age-hardening. It is normally furnished in the annealed condition. It is important to anneal after hot or cold working in order to restore optimum corrosion resistance.

 

Alloy

UNS Number

Alloy G-30

UNS N06030

 

GENERAL PROPERTIES

With higher chromium, added cobalt and tungsten alloy G30 is an improved version of nickel-chromium-ironmolybdenum-copper alloy G-3. G-30 shows superior corrosion resistance over most other nickel and iron based alloys in commercial phosphoric acids as well as complex environments containing highly oxidizing acids. The resistance of the alloy to the formation of grain boundary precipitates in the heat-affected zone makes it suitable for use in most chemical process applications in the as-welded condition.

 

RESISTANCE TO CORROSION

Alloy G-30 provides very high resistance to the hydrofluoric acid and nitric acid solutions that are utilized in the stainless steel pickling. This specific application includes dilute 15% nitric acid and 5% hydrofluoric acid at temperature of 140°F or 60°C. It also offers superior resistance to the industrial phosphoric acid. The use of alloy has been increasing in the fertilizer industry for acid evaporators.

The relative resistance offered by alloy G-30 and alloy G or alloy 625 to the industrial acids is described in the varied concentrations, temperatures and pollution levels. The significant difference in the rate of corrosion is possible in the acids of equal amount though from dissimilar sources. The corrosion evaluation in the acids obtained from the different sources and functionality of G-30 alloy as compare to 625 alloy is described. Normally Alloy G-30 provides improved performance in the corrosive conditions.

 

PHYSICAL PROPERTIES

Melting Point

(°C)

Density

Modulus of Elasticity
in Tension

 1371

  8.22g/cm3

202 GPa

 

MECHANICAL PROPERTIES

Alloy

Tensile Strength
Minimum
(psi)

Yield Strength
Minimum 0.2% offset

(psi)

% Elongation
in 2" Minimum

       

G-30

Annealed

159,000

145,000

12

 

CHEMICAL PROPERTIES

Alloy

C

Mn

Cr

Fe

Si

S

Mo

Co

W

Nb + Ta

P

Cu

Ni

G-30

0.03

1.5

28.0-31.5

13.0-17.0

0.8

0.02

4.0-6.0

5.0

1.5-4.0

0.3-1.5

0.04

1.0-2.4

Bal

 

WELDING

Alloy G-30 is easily weldable through Gas Tungsten Arc welding, Gas Metal Arc welding and shielded metal arc welding methods. The welding features are similar to Alloy G-3. Submerged arc welding is not preferred because this procedure includes extensive heating of base metal and slows weld quenching.

Basic Metal: The joining surface and around space is cleaned properly for welding. Every kind of contaminant and foreign material like oil crayon marks, sulphur compounds and grease and other materials are removed.

Filter metals: Machining work filer metal is preferred for welding. For Gas Tungsten Arc welding, Gas Metal Arc welding, Alloy G-30 filler wire is recommended. For shielded metal arc welding, G-30 alloy covered electrodes are preferred.

 

HEAT TREATMENT

Alloy G-30 is capable of being annealed. However, this alloy must be solution-annealed after hot forming in order to restore its resistance to corrosion.

 

Alloy

UNS Number

Alloy G

UNS N06007

 

GENERAL PROPERTIES

Super alloys are metallic alloys used at high temperatures above 540°C (1000°F) where high surface stability and deformation resistance are mainly required. Three major classes of super alloys include iron-base, nickel-base and cobalt-base alloys. The iron-base super alloys are generally wrought alloys with stainless steel technology. Nickel-base and cobalt-base super alloys may be cast or wrought based on its composition or application. Super alloys are commonly forged, rolled to sheet or produced in various shapes. However, highly alloyed compositions are produced as castings.

The following datasheet provides a detailed description of Alloy G, which has good resistance to both oxidation and reduction.

 

MACHINEABILITY

Alloy G can be machined using conventional techniques employed for iron based alloys. The quality of the alloy can be improved with the utilization of water-base coolants. Heavy duty machining tools and equipment can be used prior to cutting in order to reduce chattering or work-hardening of the alloy.

 

PHYSICAL PROPERTIES

Melting Point

(°C)

Density

Modulus of Elasticity
in Tension

1343

  8.91g/cm3

192 GPa

 

MECHANICAL PROPERTIES

Alloy

Tensile Strength
Minimum
(psi)

Yield Strength
Minimum 0.2% offset

(psi)

% Elongation
in 2" Minimum

       

G

110,000

102k – 125k

20

 

CHEMICAL PROPERTIES 

Alloy

Cr

Fe

Mo

Co

Nb

Cu

Mn

Si

W

C

P

S

Ni

G

21.0-23.5

18.0-21.0

5.5-7.5

2.5

1.75-2.5

1.5

1.0-2.0

1.0

1.0

0.05

0.04

0.03

Bal

 

WELDING

Welding of Alloy G is performed through commonly used welding techniques like gas tungsten arc welding, shielded metal-arc welding, metal-arc welding and submerged-arc welding. However, an alloy filler metal that suits this alloy should be used.

 

HEAT TREATMENT

Annealing of Alloy G can be performed at 1177°C (2150°F) followed by rapid cooling of air and water quenching.

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