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Nickel alloy sheet

Suntek Steel has an inventory of 625 nickel-alloy sheets in the 3/16" to 3" thickness range for use in seawater, aviation, chemical processing equipment and nuclear waste reactor parts。

3/16" 1/4" 3/8" 1/2" 5/8" 3/4" 1"
4.8mm 6.3mm 9.5mm 12.7mm 15.9mm 19mm 25.4mm
 
1 1/4" 1 1/2" 1 3/4" 2" 2 1/2" 3"
31.8mm 38.1mm 44.5mm 50.8mm 63.5mm 76.2mm

Alloy 625 (UNS NO6625) is an austenitic high temperature nickel alloy。625 alloy has good oxidation resistance and corrosion resistance, which is used in jet, engine, aviation and chemical fields。At low temperatures up to 2000 0F (1093 0C), 625 alloy has high strength and hardness。625 alloy also has high fatigue strength。

Specification details of 625 alloy (UNS NO6625)

Superheat resisting alloy with nickel as main component

常规特性

625 alloy (UNS6625) is an austenitic superheat alloy with nickel as the main component. It has excellent properties of oxidation resistance and corrosion resistance, and is suitable for many fields including jet engine environment, aviation and chemical processing。The alloy also has extraordinary fatigue resistance at low temperatures up to 2,000 degrees Fahrenheit (1,093 degrees Celsius)。

The strength of 625 alloy comes from the strengthening effect of molybdenum and niobium solid solution contained in ni-Cr alloy。These elements also give the alloy excellent corrosion resistance。Although the alloy is designed to withstand the strength of high-temperature environments, its high alloy combination gives it a high tolerance to general corrosion as well as to a wide range of oxidized and non-oxidized environments。The chromium and molybdenum contents make the alloy have excellent properties of resistance to corrosion spots caused by chloride ions, and the high nickel content enhances the resistance of the alloy to chloride stress corrosion cracking。

The material is highly formable and easier to weld than many nickel-based alloys。The alloy remains resistant to intergranular corrosion even when it is welded。

625 alloy can be produced by vacuum magnetic induction melting or argon oxygen decarburization (AOD)。Consumable electrode redissolution can be used for further refining。


应用领域

  • 海水
  • Aerospace vehicle components
  • Chemical treatment plant
  • Nuclear water reaction member

标准

ASTM..................B 443
ASME..................SB 443
AMS ...................5599

化学分析

化学分析 (weight %)

0.05 0.030 0.010 0.003 0.25 22.0
镍  铌 +钽
平衡 9.0 3.5 0.3 0.3 4.0

抗腐蚀及氧化能力

The high content of chromium and molybdenum in 625 alloy provides the alloy with a high degree of resistance to corrosion spots and fission corrosion against chloride-contaminated media such as seawater, neutral salts and saltwater。

Typical data obtained in chloride solution

Cracking test in solution containing 10% ferric chloride 316 合金 625合金
Starting temperature as per astm procedure <32
(<0)
104-113
(40-45)

Plate exposed to sea water test

Plate location
The initial temperature
316合金 625合金
Flow of water Subject to cracking corrosion
A month
Is not affected
18个月
Tidal zone Subject to cracking corrosion
A month
Is not affected
18个月
Partial soil burial Subject to cracking corrosion
A month
Is not affected
18个月

The alloy is resistant to corrosion in a wide range of corrosive media from highly oxidized to moderately reduced oxidized environments。

The results of geothermal brine test show that 625 alloy has very high resistance to geothermal water, and its corrosion resistance is comparable to that of titanium ii。

The environmental test of simulated pipeline gas desulfurization shows that 625 alloy has high corrosion resistance compared with 316 alloy. Its corrosion resistance is comparable to 276 alloy。

Illustrate with the following data。Typical corrosion rates are measured in mils/year(mm/a)。

Boiling solution of organic acids

合金 45%蚁酸 10%草酸 88%蚁酸 99%乙酸
625合金 5.0 (0.13) 6.0 (0.15) 9.0 (0.23) 0.4 (0.01)
316合金 11 (0.28) 40 (1.02) 9.0 (0.23) 2.0 (0.05)

Dilution reduces acid content - boiling solution

合金 1%硫磺 5%硫磺 10%硫磺 1% hydrochloric acid
625合金 2.2 (0.06) 8.9 (0.23) 25.3 (0.64) 36.3 (0.92)
316合金 25.8 (0.65) 107 (2.72) 344 (8.73) 200 (5)

The sulfonic acid sample was activated prior to the test, and the hydrochloric acid sample was not activated prior to the test。

Mixed environment

环境 625合金 316型
20%磷酸 .36 (<0.01) 6.96 (0.18)
10% sulfanilic acid 4.80 (0.12) 63.6 (1.61)
10% sodium bisulfate 3.96 (0.10) 41.6 (1.06)

Chloride stress corrosion fission test

试验 625合金 316合金 20合金
42% magnesium chloride No fission
000小时
裂变
〈24小时
裂变
〈100小时
26% sodium chloride No fission
000小时

裂变
600裂变

No fission
1000裂变

Oxidation resistance
625 alloy has excellent oxidation resistance and phosphorous corrosion resistance at high temperature up to 2000 degrees Fahrenheit (1093 degrees Celsius)。Under the condition of cyclic heating and cooling, the performance of 625 alloy exceeds that of other high-temperature resistant alloys。The following chart shows the weight loss of alloy 625 compared with several stainless steel alloys at 1800 ° F (982 ° C) cycle oxidation。

formability

625 alloy can be processed as standard austenitic stainless steel。The material is much stronger than conventional austenitic stainless steel and therefore requires a higher load to deform it。The material hardens faster than austenitic stainless steel during cold work。If a large area of cold deformation occurs, the material may require intermediate annealing due to its initial high strength and rapid work hardening。

Effects of cold compression on sheet properties annealed at 2150 ° F (1177 ° C)

Cold compression 硬度
Rockwell C
Produce hardness
(抵消0.2%)
%   psi (Mpa)
0 88Rb 49,500 341
5 94Rb 77,500 534
10 25 102,500 707
15 32 112,500 776
20 34 125,000 862
30 36 152,000 1048
40 39 167,000 1151
50 40 177,000 1220
60 44 180,500 1245
70 45 201,000 1386
Cold compression Stretch strength Extend the degree of Narrow the scope of
% psi (Mpa) % %
0 115,500 796 67.0 60.4
5 121,000 834 58.0 58.1
10 130,000 896 47.5 54.6
15 137,000 945 39.0 51.9
20 143,000 986 31.5 50.0
30 165,000 1137 17.0 49.3
40 179,500 1238 12.5 41.9
50 189,500 1307 8.5 38.0
60 205,000 1413 6.5 32.7
70 219,000 1510 5.0 25.4

机械特性

Typical transient elongation under temperature

The elongation properties of materials annealed at 1920 ° F (1065 ° C) at typical room temperature are shown in the table below

Generating intensity (cancels out 0.2%) Final elongation strength Extension (% per 2 inches)
63000 psi (430 MPa) 136000 psi (940 MPa) 51.5

The elongation properties of a material annealed at 2150 ° F (1177 ° C) in its dissolved state at typical room temperature are shown in the table below

Generating intensity (cancels out 0.2%) Final elongation strength Lengthen (% per 2 inches
49500 psi (340 MPa) 115500 psi (800 MPa) 67

The elongation properties of 625 alloy annealed at 1950 ° F (1066 ° C) at a short temperature rise in time are shown below。

焊接

625 alloy can be directly treated with the same conventional procedures as austenitic stainless steel, including welding and resistance methods。Prior to welding, the material shall be thoroughly removed from dirt and cleaned under annealing conditions in the factory。No preheating or post-welding treatment is required to maintain or restore the corrosion resistance of the material。

热处理

For optimum properties, the alloy 625 is annealed at temperatures up to 1200 ° F (649 ° C) in the first annealing and over 1200 ° F (649 ° C) in the second.。The minimum standard annealing temperature is 1600 ° F (871 ° C). This temperature can replace the usual 1200 ° F (649 ° C).。
Although temperatures above 1200 ° F (649 ° C) are commonly used, a minimum of 2000 ° F (1093 ° C) solution annealing is required when optimal creep and fission properties at high temperatures are required。In solution annealing conditions, to further improve the sensitivity, it is sometimes required to be stabilized by reannealing at 1800 ° F (982 ° C)。

物理特性

密度
0.305 Ib/in3
8.44 g/cm3

Specific gravity
8.44

The melting range
2350°-2460°F
1280°-1350°C

Magnetic permeability
Oersted 1 75 ° F, 200.0006

Specific heat
0.098 Btu/lb.-°F
Joules/kg - 410 ° K

The resistance coefficient of

温度 The resistance coefficient of
Microohm - centimeter
华氏 摄氏
70 21 128.9
100 38 129.6
200 93 131.9
400 204 133.9
600 316 134.9
800 427 135.9
1000 538 137.9
1200 649 137.9
1400 760 136.9
1600 871 135.9
1800 982 134.9
2000 1093 133.9

Thermal characteristics

温度 Coefficient of thermal straightness
膨胀
Heat conduction
华氏 摄氏 华氏 摄氏 Btu-ft / ft2 h-°F W/m - ° K
-250 -157 4.2 7.3
-200 -129 4.3 7.4
-100 -73 4.8 8.3
0 -18 5.3 9.2
70 21 5.7 9.9
100 38 5.8 10.0
200 93 7.1 12.8 6.3 10.7
400 204 7.3 13.1 7.3 12.6
600 316 7.4 13.3 8.2 14.2
800 427 7.6 13.7 9.1 15.7
1000 538 7.8 14.0 10.1 17.5
1200 649 8.2 14.8 11.0 19.0
1400 760 8.5 15.3 12.0 20.8
1600 871 8.8 15.8 13.2 22.8
1700 927 9.0 16.2
1800 982 14.6 25.3

1 Average coefficients range from 70 degrees F (21 degrees C) to the temperatures shown
2 Measurements were obtained at the Battelle Memorial Institute
3 Material annealing temperature is 2100 degrees Fahrenheit (1149 degrees Celsius)

The coefficient of the data

温度 Hardness coefficient Modulus of elasticity
华氏 摄氏 Units of 106 psi Units Gpa Units of 106 psi Units Gpa
70 21 11.4 79 29.8 205
200 93 11.2 77 29.2 200
400 204 10.8 75 28.4 195
600 316 10.5 72 27.5 190
800 427 10.1 70 26.6 185
1000 538 9.7 67 25.6 175
1200 649 9.2 63 24.4 170
1400 760 8.7 60 23.1 160
1600 871 8.2 57 -- --
温度 Transverse deformation coefficient
华氏 摄氏 (µ)
70 21 0.308
200 93 0.310
400 204 0.312
600 316 0.313
800 427 0.312
1000 538 0.321
1200 649 0.328
1400 760 0.329
1600 871 --

(The transverse deformation coefficient is calculated by computer based on this formula

耐受效果

Alloy 625 maintains high impact resistance at low temperatures as shown below.

Typical characteristics of 625 alloy

Test temperature Propensity to Effect of energy
华氏 摄氏 Ft-lbs Joules
85 30 Longitudinal 49 66
85 30 Transverse 49 66
-110 - 79 Longitudinal 44 60
-110 - 79 Transverse 41.5 56
-320 -196 Longitudinal 35 47
-320 -196 Transverse 35 47

Keyhole notched impact sample (3 tests)

The properties may be reduced if the material is placed between 1200 and 1600 degrees F (649-871 degrees C) and the test time is extended。

The technical data and information provided here represent our best knowledge at present, however, due to our ongoing research on the corrosion rating project, these data and information may change slightly, therefore, we recommend that you approve with us when placing orders and inquiring。In addition, the actual conditions for each application have its particularity。The data provided here is for descriptive purposes only, and the data and information are subject to official written confirmation by our company。