alloy59

① ASTiM G-28A： 50%H2SO4 +42g/L Fe2(S04)3。(D ASTM G-28B： 23%H2S04 + 1.2%HC1 + l%FeCl3 +1%CuC12o ③11. 5% H2S04 + 1. 2% HC1 + 1 % FeCl3 +1% CuCl20

Table 8-70 Corrosion of Ni-Cr-Mo Alloy in Hazardous Waste Incinerator/Purifier (1991h)

Alloy	corrosion rate/mm • a-1	Remark	Alloy	Corrosion rate/mm • a-1	Remark
Alloy 59	0.03	Clean	C276	0.89	Clean
Alloy 686	0. 14	Clean	625	1.49	Rough
C-22	0. 17	Clean	825	2. 97	Pitting

Table 8-71 Thermal stability of sensitized Ni-Cr-Mo alloy (sensitized at 871 °C) in ASTM G-28A

aging time/h	corrosion rate/mm • a_l
	C-276	C-22	alloy686	C-2000	alloy59
1	>12.7®	>12.7®	22. 15®	2. 95®	1.02®
3	>12.7®	>12.7®	>25.4®	4. 52①	1.29®
5	>12.7®	> 12.7®	>25.4®	5.26®	一

1 Depth intergranular corrosion, strict IE pitting and grain shedding.
2 No pitting.

Table 8-72 Thermal stability of sensitized Ni-Cr-Mo alloy (871 ° C: sensitized) in ASTM G-28B

aging time/h	corrosion rateAnm – a’1
	C-276	C-22	686	C-2000	59
1	> 12.7®	8.610	0.43®	>12.7®	0. 10®
3	>12.7®	7.95®	2. 16®	>12.7®	0. 10®
5	> 12.7®	>12.7®	>12.7®	>12.7®	0.43®

1 Depth intergranular corrosion, severe pitting and grain shedding.
2 No pitting.

C pitting and crevice corrosion
Alloy5 alloy has good pitting and crevice corrosion resistance, in some media
The test results are shown in Table 8-73 and Table 8-74.
Table 8-73 Critical pitting temperature (CPT) and crevice corrosion temperature (CCT) of 00Cr23Ni59Mol6 alloy (7% (volume fraction) H2S04 +3% (volume fraction) HC1 + 1 %CuCl, +1.0% FeCl3 – 6H,0 )

Alloy	CVT/°C	CCT/°C
00Cr23Ni59Mol6(59)	>130	110
00Crl6Ni60Mol6W4( C-276)	115-120	105
!Cr22Ni60Mo9N64(625)	100	85 -95

Table 8-74 CPT and CCT of 00Cr23Ni59Mol6 Alloy in 10% FeCl3 Solution (ASTM G48)

Alloy	PRE①	CPT/℃	CCT/℃
C-22	65	>85®	58
C-276	69	>85	>85
Inconel 686	74	>85	>85
00Cr23Ni59Mol6(59)	76	>85	>85
C-2000	76	>85	>85

® PRE = %Cr + 3. 3% Mo0 2 is higher than 85T, and the chemical attack of 10% FeCl3 solution is destroyed.

D welding
Alloy59 alloy has good weldability and can be welded using conventional welding methods (GTAW, plasma, MIG, TIG, manual welding arc). The material before welding should be in a solution treatment state. The metal-filled ingredients are the same as the base metal.
8. 3. 6. 4 Physical properties
The physical properties of Alloy59 alloy: density 8.6g/cm3; melting temperature range 1310 ~ 1360 °C; relative magnetic permeability (20 °C) ≤ 1.001; other physical properties are shown in Table 8-75.

Table 8-75 Physical properties of alloy59 alloy at room temperature and high temperature

Temperature	Specific heat capacity /J•(kg.K)-i	/W • (m • K)	Thermal conductivity/um• cm	Elastic Modulus/GPa	Linear expansion coefficient (room temperature)/10-6K-1
20	414	10.4	126	210	—
93	—	—	—	206	—
100	425	12. 1	127	207	11.9
200	434	13.7	129	200	12.2
204	—	—	—	199	—
300	443	15.4	131	196	12.5
316	—	—	—	194	一
400	451	17.0	133	190	12.7
427	—	—	—	188	—
500	459	18.6	134	185	12.9
538	—	—	—	181	—
600	464	20.4	133	178	13. 1

8.3.6.5 Thermal processing, cold working, heat treatment and welding performance
(1) Thermal processing. The alloy has a hot working temperature range of 950 to 1180 ° C, preferably 1160 ° C, and is water cooled after processing.
(2) Cold working. The solid solution alloy has good cold workability, but the work hardening speed is high. In order to facilitate cold working, intermediate softening annealing should be performed in time.

(3) Heat treatment. The solution treatment temperature is 1100~1180 °C, the suitable temperature is 1120 °C, and the water should be cooled after heating and maintaining the best corrosion resistance.

8.3.6.6 Application
The application field of 00Cr23Ni59Mol6 alloy is similar to that of other Ni-Cr-Mo-W alloys, and the alloy can not be used satisfactorily in C-276 and C-4 alloys. The effects of use in some application areas are summarized in Table 8-76.

Table 8-76 Special Application Fields for Alloy 59

Name	Medium	Remark
Fluorination, gasification reaction, pressure vessel	Hydrocarbon, ammonium telluride, patented catalyst (one atom F replaces one atom Cl), H2S04	The life of C-276 alloy is 丨2 ~ 14 months, and the life of alloy 59 is increased by 3~4 times.
Rotary kiln produced by HF	HF\ H2S04	Corrosion resistance is better than 686, C-22, C-2000
Coal-fired power plant–FGD	H2S04、HC1、HF、Cl-,F-，Under condensing conditions Cl-> 105 x10-6, F > 104 x 106, pM < 1	Alloys with lower fit have poor corrosion resistance and only a few days or weeks of life. Alloy 59 is suitable and has been used for thousands of tons.
Acrylate/methacrylate reactor, serpentine heater	Fatty alcohol + acrylic acid + iodic acid, 130deg	The corrosion rate of Monel 400 is 0. 75mm/a, the turbidity of alloy 59 is <0.025m/a, and the service life of equipment is more than 5 years.
Licoric acid production plant	Potassium citrate + concentrated sulfuric acid	6% Mo Super Stainless Steel quickly fails. The first reactor built by Alloy 59 has been in good condition since 1990.
Copper factory	5% H2S04 Washing rich S02气（45 – 60^), 生产50% 〜55% H2S04 (75℃), 7000 x10_6C1_，7000 x 10′6F’	The 20 alloy and rubber-lined equipment quickly destroyed. Alloy 59 has a corrosion rate of <0.025mm/a and no local corrosion; the alloy 59-row fan remains intact after 4 years of operation.
Hydrochloric acid production	H, Cl combustion produces HC1 acid	Better than C-22 alloy
Acetic acid factory	Sulfate, acetic acid, phosphate, vapor（PH = 1), 100¾	The corrosion rate of the C-276 is 0.4 mm/a, and the corrosion rate of the alloy 59 is 0. 04 mm/a.
Gold production	Depositing sponge gold from an electrolyte containing dilute gold diluted hydrochloric aci。 HC1, 150℃	The cathode plate is corroded by severe St. Alloy 59 has been operating well since 1990