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Hastelloy B-3, NS 3203

Hastelloy B-3, NS 3203

00Mo30Ni65Fe2Cr2 (B-3 alloy) is a new generation Ni-Mo corrosion-resistant alloy introduced by Haynes Company in the mid-1990s, trying to solve the technical trouble caused by insufficient thermal stability of Hastelloy B-2 alloy. The basis of the development is the research results of the combined effects of Fe and Cr on the thermal stability and corrosion resistance of Ni-Mo alloy. The addition of the appropriate amount of Cr and Fe and the other main components are controlled by the B-2 alloy composition interval. The alloy 3 greatly improves the thermal stability of the Ni-Mo alloy, while retaining the corrosion resistance of the B-2 alloy, so that the cracking of the B-2 alloy and the cracking of the hot working process can be solved.

7.3.3. 1 Chemical composition and structural characteristics
The chemical composition of 00Mo30Ni65Fe2Cr2 (B-3 alloy) is shown in Table 7-6. Compared with the B-2 alloy, this alloy reduces the carbon to less than 0.01%, adds more than 1% Cr, controls Fe in the range of 1% to 3%, and increases the amount of Mo by 1%. These changes reduce the precipitation of carbide and the intermetallic phase, Ni4Mo, which greatly improves the thermal stability of the alloy while retaining the corrosion resistance of the B-2 alloy. The alloy consists of a supersaturated single-phase a structure at both high and low temperatures. The medium-temperature short-time aging (<lh) does not cause phase separation between Ni4Mo and Ni3Mo, the carbon content is very low, and the carbides are also extremely rare.
7.3.3.2 Mechanical properties
The room temperature mechanical properties of 00Mo30Ni65Fe2Cr2 (B-3) alloy containing Cr1.5 and Fe1. 5 are shown in Table 7-36. The transient mechanical properties at high temperature are shown in Table 7-37.

Table 7-36 Mechanical properties of 00Mo30Ni65Fe2Cr2(B-3) alloy at room temperature

Material specification

Temperature

Rm/MPa

Rp0.2/MPa

A(51mm)/%

Z/%

3. 2mm Annealed plate

room temperature

860

420

53.4

6.4mm Medium plate, thick plate

room temperature

885

400

57. 8

67.5

Table 7-37 High-temperature transient mechanical properties of 00Mo30Ni65Fe2Cr2(B-3) sheet

material type

Temperature/°c

Rm/MPa

Rp0.2/MPa

A(51mm)/%

Z/%®

3. 2mm Bright annealed sheet

95

830

380

56.9

205

760

325

59.7

315

720

300

63.4

425

705

290

62.0

540

675

270

59.0

650

715

315

55.8

6. 4mm Solution treatment : plate, thick plate

95

845

375

58.2

67.3

205

795

330

60.9

68. 1

315

765

305

61.6

65.5

425

745

285

61.7

64.9

540

730

275

61.7

61.5

650

735

290

64.6

54.9

7.3.3.3 Thermal stability
The aging thermal stability data for Hastelloy B-3 alloy is shown in Table 7-38, and the TTT (Temperature-Time-Transition) graph is shown in Figure 7-35. The elongation after 700T aging is shown in Figure 7-36. These data fully demonstrate that the thermal stability of 00MO30Ni65Fe2Cr2(B-3), which controls Fe and Cr content, is much better than that of B-2 alloy, achieving the intended purpose of developing this alloy, which not only facilitates the manufacture and processing of equipment or components. It also creates conditions for resistance to intergranular corrosion and stress corrosion resistance. The data of these results also indicate that temperature is the key to the decline of alloy plastic toughness in the range of aging temperature and aging time studied, further illustrating the harmfulness of Ni4Mo precipitation.

Table 7-38 Ageing Thermal Stability of 00Mo30Ni65Fe2Cr2(B-3) Alloy

Aging temperature/°C

Aging time/h

Rm/MPa

Rp0.2/MPa

A/%

Z/%

AKV/J

890

385

60.4

73.0

358

425

1000

900

405

57.2

71.7

358

4000

905

410

56.8

71.6

358

8000

870

395

51A

70.5

358

12000

880

405

57.5

70.4

358

1600

915

410

57.6

71.4

358

480

1000

970

535

50.0

67. 1

355

4000

995

580

48.3

65.5

358

8000

960

555

48.9

64.4

285

12000

975

565

49.9

65.2

313

16000

1020

590

48.8

64.6

237

540

1000

1005

570

48.4

64.7

320

4000

1055

615

45.6

61.4

145

8000

1050

625

47. 1

59.5

79

12000

1060

635

44.2

59.2

111

16000

1120

660

43.7

57.5

79

 

1000

1165

720

38. 8

54.9

24

 

4000

1230

810

31.5

37.2

20

595

8000

1210

815

28.7

35.7

18

 

12000

1230

830

26.4

31.7

16

 

16000

1280

870

25.3

29.6

11

7. 3. 3. 4 Corrosion resistance General corrosion
Compared with B-2 alloy, 00Mo30Ni65Fe2Cr2(B-3) alloy has higher Mo content, and the content of Fe and Cr is controlled within the range that does not adversely affect the alloy. Therefore, the overall corrosion resistance of B-3 alloy should be slightly better. For the B-2 alloy, some corrosion data are shown in Tables 7-39, 7-40, and 7-37. The results of corrosion resistance in some acid solutions compared to other materials are shown in Table 7-41.

Table 7-39 Corrosion resistance of 00Mo30Ni65Fe2Cr2 in some acids

Material status

Media composition

Media score/%

Temperature

Time/h

Average corrosion rate /mm • a - 1

Solution annealing

acetic acid

10

Boiling

4 x24

0. 005

30

4 x24

0.005

50

4 x24

0. 005

70

4 x24

0. 005

90(冰醋酸)

4 x24

0.017

Solution annealing

Formic acid

10

Boiling

4 x24

0.010

20

4 x24

0.015

30

4 x24

0.015

40

4 x24

0.013

60

4 x24

0. 008

89

4 x24

0. 005

Solution annealing

hydrochloric acid

1

Boiling

4 x24

0. 005

2

4 x24

0. 03

5

4 x24

0. 10

10

4 x24

0. 14

15

4 x24

0. 22

20

4 x24

0.31

Welded state

hydrochloric acid

20

Boiling

4 x24

0. 35

hydrochloric acid+50×10-6Fe3 +

20

Boiling

4 x24

2.2

   

10

Boiling

4 x24

0.06

Solution annealing

Phosphoric acid (chemically pure)

30

Boiling

 

4 x24

0.05

50

Boiling

 

4 x24

0.08

   

85

Boiling

 

4 x24

0.07

   

2

Boiling

 

4 x24

0.01

Solution annealing

sulfuric acid

5

Boiling

 

4 x24

0.018

10

Boiling

 

4 x24

0.020

   

30

Boiling

 

4 x24

0. 03

 

h2so4 +

50 x 10~6Fe3+

30

Boiling

 

4 x24

0.48

Solution annealing

40

Boiling

 

4×24

0. 03

 

50

Boiling

 

4 x24

0.04

Welded state

sulfuric acid

50

Boiling

 

4 x24

0. 06

540¾ x48h

Aging

 

50

Boiling

 

4 x24

0.05

sulfuric acid

60

Boiling

 

4×24

0.06

 

70

Boiling

 

4 x24

0. 17

Table 7-40 Average Corrosion Rate of Solution Annealed Hastelloy B-3 Alloy in HF Acid Solution

HF concentration /%

Average corrosion rate/mm– a-1

52*C

19X.

1

0. 22

0. 26

3

0. 22

0.32

5

0. 23

0. 35

10

0. 25

0.41

20

0. 30

0.58

48

0. 34

0. 89

70

0. 80

Table 7-41 Corrosion resistance of 00Mo30Ni65Fe2Cr2 in several boiling acids compared with other corrosion resistant materials

Media composition

Average corrosion rate/mm – a-1

B-3 alloy

B-2 alloy

Ni68Cu28Fe

0Crl7Nil4Mo2

50% acetic acid

0.005

0.010

0. 005

40% Formic acid

0.013

0.018

0. 053

1.014

50% ~55%  Phosphate

0.076

0. 152

0. 114

0. 457

50% sulfuric acid

0. 043

0. 030

4. 699

>500

20% hydrochloric acid

0.305

0.381

40. 31

>500

Under the condition of less than 50% cold deformation, although the strength of B-3 alloy increases, the plasticity decreases, but it does not affect the corrosion resistance of this alloy in boiling 20% HC1 acid (Table 7-42). The general corrosion resistance of B-3 alloy in reducing acid can be seen, and B-3 alloy has the best corrosion resistance.

Table 7-42 Corrosion Resistance of Cold Deformed 00Mo30Ni65Fe2Cr2 Alloy in Boiling 20% HC1 (4 x 24h Test)

Cold processing/%

hardness HRC

Rm/MPa

Rp0.2/MPa

A(51mm)/%

Corrosion rate/mm• a_l

0

18

860

425

57

0.33

10

30

965

690

40

0. 33

20

37

1095

895

25

0.33

30

41

1240

1060

13

0. 33

40

44

1395

1185

9

0. 33

50

46

1525

1280

8

0.33

B intergranular corrosion
hastelloy B-3 welded sample in 110 ° C, 20% ~ 30% H2S04 + ferrous sulfate (pH < 1) solution after 96 days of the test results indicate that the heat affected zone of 00Mo30Ni65Fe2Cr2 alloy does not see intergranular Corrosion, while B-2 alloy produces intergranular corrosion (Table 7-43).

Table 7-43 Corrosion resistance of 00Mo30Ni65Fe2Cr2(B-3) alloy welding specimen

Alloy

status

Corrosive medium

test hour

/d

Corrosion rate/mm – a-1

Intergranular corrosion

00Mo30Ni65Fe2Cr2

after welding

HOT:, 20% – 30% II2S04+ FeS04, pH < ]

96

0.06

None

Hastelloy B-2

after welding

not:, 20% – 30% H2S04+ FeS04, pH < 1

96

0. 08

HAZ Intergranular corrosion

C stress corrosion
After annealing and subsequent 700^x lh aging U-bend specimens in boiling 60% H2S04*, 24h test results according to ASTM GT-30 method showed that B-3 alloy did not produce stress corrosion, while B-2 alloy Intergranular stress corrosion cracking occurred after 3 hours of the test. The results of stress corrosion test in H2S04 and HC1 of medium and heavy plate and thin plate specimens (annealing +700 °C x lh aging) also show that the stress corrosion resistance of B-3 alloy is much better than that of B-2 alloy (Table 7). -44).

Table 7-44 SCC Performance of 00Mo30Ni65Fe2Cr2 Medium and Heavy Plates

Media composition

Sample status

test results

B-2 alloy

B-3 alloy

boiling 5% II2S04

annealing+700¾ xlh aging

IG-SCC

none SCC

boiling 0.5%H2S04

annealing+700¾ xlh aging

IG-SCC

none SCC

boiling 20% HC1

annealing+700¾ xlh aging

IG-SCC①

none SCC

7. 3.3.5 Thermal processing, cold forming, heat treatment and welding performance
(1) Thermal processing. The hot workability of 00Mo30Ni65Fe2Cr2 alloy is good. The suitable heating temperature is 1230T. After the processed alloy is fired to reach the overall temperature uniformity, the hot processing operation will not encounter difficulties. Because the carbon content of the alloy is very low, in order to obtain hot processing. After the fine grain structure, the lower final deformation temperature and the appropriate final deformation should be controlled. Since the alloy has better thermal stability than the B-2 alloy, it does not encounter the trouble of the B-2 alloy during the thermoforming process.
(2) Cold forming. Although this alloy is sensitive to cold work hardening, it has good cold workability and can be cold worked by a usual cold forming method.
(3) Heat treatment. The supply state of 00Mo30Ni65Fe2Cr2 alloy is solution annealing, and the product which can be rapidly cooled has an annealing temperature of 1065T and rapid quenching after heat preservation. The rolled sheet and wire have a bright annealing temperature of 1150T and a cooling method of hydrogen cooling.
(4) Welding. The 00Mo30Ni65Fe2Cr2 alloy has good weldability and can be welded by the general method of GTAW, GMAW and SMAW. In the welding process, excessive heat input should be prevented, and the interlayer temperature should be controlled below 93 °C. Oxyacetylene and submerged arc welding are not recommended.
The welded filler metal may be a solder material of the same composition as the base material. The mechanical properties of the weld metal after welding can meet the engineering needs (Table 7-45).

Table 7-45 Mechanical properties of weld metal after welding with the same composition as B-3 alloy

Welding process

 Test temperature Rm/MPa Rp0.2/MPa

A/%

AKV/J

GTAW

room temperature

813

551

45

224

GMAW

room temperature

834

537

46

191

SMAW

room temperature

772

475

49

118

GTAW

300

710

469

40

GTAW

400

689

455

45

7. 3. 3. 6 Physical properties
The physical properties of  hastelloy B-3 alloy are shown in Table 7-46 and Table 7-47.

Table 7-46 Physical properties of hastelloy B-3 alloy

Temperature/°c

Dynamic elastic mode    M

/GPa

Resistivity

/un• cm

Thermal diffusivity

/cm2• s-1

Thermal conductivity

/W • (m.K) -1

Specific heat capacity

/J.(kg .K)-1

Room temperature

216

137

3.0 xlO-3

11.2

373

100

213

137

3.2 xlO-3

12. 1

382

200

208

137

3.4 x 10-3

13.4

409

300

202

138

3.7 xlO-3

14. 8

421

400

197

138

4.0 x 10′3

16.3

431

500

190

140

4. 4 x 10′3

17.9

436

600

185

143

4.5 xlO-3

19.6

434

700

178

142

4.9 x lO-3

21.4

595

800

168

137

4.7 x 10 _3

23.3

589

900

157

132

4.5 x 10-3

25.4

577

1000

147

130

4.9 x 10-3

27.5

575

Note: 1. Density: room temperature 9.22g/cm3;

2. Melting point range: 1370-1418 °C

Table 7-47 Linear expansion coefficient of 00Mo30Ni65Fe2Cr2(B-3) alloy

Temperature/$

Linear expansion coefficient/x10-6K-1

Temperature/°C

Linear expansion coefficient/x10-6K-1

25 ~ 100

10.6

25 -600

11.8

25 – 200

11. 1

25 -700

12.2

25 -300

11.4

25〜800

13. 1

25 -400

11.6

25 -900

13.9

25 -500

11.8

25 - 1000

14.4

7.3.3.7 Application
This alloy is used in the same field as the Hastelloy B-2 alloy. The thermal stability of the alloy is much better than that of the alloy B-2, so its resistance to intergranular corrosion and stress corrosion is better than B-2. For products with stricter requirements for welding and thermoforming, it is advisable to use 00Mo30Ni65Fe2Cr2 (B-3) alloy.

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Post time: May-24-2019