Kovar 29/4J29 kovar metal made in china kovar rod in alibaba supplier

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$26.27 - $30.77 / Kilograms | 100 Kilogram/Kilograms (Min. Order)
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Overview
Quick Details
Place of Origin:
Liaoning, China (Mainland)
Type:
Nickel Bar
Application:
Industry
Grade:
Nichrome
Ni (Min):
29%
Resistance (μΩ.m):
Stable
Powder Or Not:
Not Powder
Ultimate Strength (≥ MPa):
517
Elongation (≥ %):
30 %
Model Number:
Kovar 29
Brand Name:
DLDT
Standard:
ASTM/GB
Material:
Kovar 29/4J29
Certification:
MTC
Surface:
Black or Bright
Product name:
Kovar 29 alloy tube round bar made in china
Technique:
hot rolled, cold rolled
Available Product Forms:
Round/Square/Wire/Plate/Strip
Certificate:
MTC/Country of origian/other you need
Supply Ability
Supply Ability:
20000 Ton/Tons per Year
Packaging & Delivery
Packaging Details
Usually the bright surface packed in wooden case
Port
Dalian
Lead Time :
About 45 to 60 days

Kovar 29/4J29 kovar metal made in china kovar rod in alibaba china supplier

 

Product Description

 Chemical compostion of Kovar 29/4J29


Element

Min

Max

Carbon

--

0.02

Nickel

--

29.0

Iron

Balance

Silicon

--

0.20

Manganese

--

0.30

Cobalt

--

17.0

 

Description of Kovar 29/4J29

 

Kovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties. Extensive quality controls are employed in the manufacture of this alloy to ensure uniform physical and mechanical properties for ease in deep drawing, stamping and machining.

 

Applications of Kovar 29/4J29

 

Kovar alloy has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials.

This alloy has found wide application in power tubes, microwave tubes, transistors and diodes. In intergrated circuits, it has been used for the flat pack and the dual-in-line package.

 

Physical Properties of kovar 29

 

Specific gravity.......................................8.36                           Curie temperature

Density                                                                                        °F.................................................... 815

lb/cu in............................................... 0.302                               °C.................................................... 435

kg/cu m............................................... 8359                            Melting Point

Thermal conductivity                                                                    °F.................................................. 2640

Btu-in/ft²/hr/°F...................................... 120                                °C................................................. 1450

W/m-K.................................................. 17.3                          Modulus of elasticity

Electrical resistivity                                                                       psi x 10(6) ..................................... 20

ohm-cir mil/ft......................................... 294                               MPa x 10(3) .................................. 138

microhm-mm......................................... 490

 

Magnetic Properties of Kovar 29/4J29

 

Kovar alloy is magnetic at all temperatures below the Curie point. Magnetic properties will depend upon heat treatment; the lower the hardness, the higher the permeability values and lower hysteresis loss. Examples of permeability properties are shown in the following chart:

Flux Density

Treatment

1830°F (999°C)
30 min. - FC
Permeability

2010°F (1099°C)
20 min. - FC
Permeability

500
1000
2000
5000
10000
12000

1000
1400
2000
2300
3400
3000

1900
3500
5800
10000
8200
5000

Thermal Expansion Properties of Kovar29/ 4J29

 

The following are the average coefficient of expansion properties after annealing in hydrogen for 1 hr at 1650°F (900°C) and 15 minutes at 2010°F (1099°C) and cooled to room temperature within 1 hr. Material heat treated using this procedure should not exhibit any transformation when cooled to -112°F (-80°C) for 4 hrs. This was determined by means of metallographic examination.

Mean coefficient of thermal expansion as annealed.

 

Temperature

Coefficient

77°F to

25°C to

10(-6)/°F

10(-6)/°C

212
392
572
662
752
842
932
1112
1292
1472
1652

100
200
300
350
400
450
500
600
700
800
900

3.25
2.89
2.85
2.72
2.81
2.92
3.41
4.34
5.06
5.73
6.25

5.86
5.20
5.13
4.89
5.06
5.25
6.15
7.80
9.12
10.31
11.26

Preparation for Sealing

 

All degreased, fabricated Kovar alloy parts should be degassed and annealed in a wet hydrogen atmosphere. Atmosphere is to be made moist by bubbling the hydrogen through water at room temperature. Care must be taken to prevent surface carbon pickup. Furnace should have a cooling chamber provided with the same atmosphere.

Heating should be conducted within the 1540/2010°F temperature range. Time at temperature should be approximately two hours for lowest temperature to 20 minutes for the highest temperature. Parts should then be transferred to the cooling zone and held until below 570°F, then removed.

An oxide film on the metallic part is preferred for metal-to-hard glass sealing. The best oxide film is thin and tightly adhering. The film can be produced by heating the parts to 1200/1290°F in regular ambient atmosphere for a time sufficient to form a dark gray to slight brown oxide.

 

Workability

 

Forging

The principal precaution to observe in forging is to heat quickly and avoid soaking in the furnace. Long soaking may result in a checked surface due to absorption of sulfur from the furnace atmosphere and/or oxide penetration. A forging temperature of 2000/2150°F is preferred.

 

Coolant

It is important to control heat build up, the major cause of warpage. A suggested coolant would be Cool Tool. Cool Tool contains fatty esters to reduce friction in the cutting zone and a refrigerant to remove the heat generated by friction between the cutting tool and work place.

 

Tooling

T-15 Alloy, such as Vasco Supreme-manufactured by Vanadium Alloys Company. M-3 Type 2, such as Van Cut Type 2-manufactured by Vanadium Alloys Company. Congo manufactured by Braeburn.

For machining with carbide tools, a K-6 manufactured by Kennemetal, Firthie HA manufactured by Firth Sterling, or #370 Carboloy could be used, or a K2S manufactured by Kennemetal, or Firthie T-04 manufactured by Firth Sterling would be satisfactory. One thing of prime importance is that all feathered or wire edges should be removed from the tools. They should be kept in excellent condition by repeated inspection.

 

Turning

If steel cutting tools are used, try a feed of approximately .010" to .012" per revolution and a speed as high as 35/FPM could probably be attained. Some of the angles on the cutting tools would be as follows:

 

End cutting edge angle -Approximately 7°

Nose radius -Approximately .005"

Side cutting edge angle -Approximately 15°

Back rake -Approximately 8°

Side rake -Approximately 8°

When cutting off high speed tools are better than carbide tools, and a feed of approximately .001" per revolution should be used. The cutting tools should have a front clearance of about 7° and a fairly big tip--larger than 25° would be helpful.

 

Drilling

When drilling a 3/16" diameter hole, a speed of about 40/FPM could possibly be used, and the feed should be about .002" to .0025" per revolution, for a 1/2" hole, approximately the same speed could be used with a feed of about .004" to .005" per revolution. The drills should be as short as possible, and it is desirable to make a thin web at the point by conventional methods. By conventional methods, we mean do not notch or make a crank shaft grinding. It is suggested that heavy web type drills with nitrided or electrolyzed surfaces be used. The hole, of course, should be cleaned frequently in order to remove the chips, which will gall, and also for cooling. The drill should be ground to an included point angle of 118° to 120°

 

Reaming

Reaming speeds should be half the drill speed, but the feed should be about three times the drill speed. It is suggested that the margin on the land should be about .005" to .010", and that the chamfer should be .005" to .010" and the chamfer angle about 30°. The tools should be as short as possible, and have a slight face rake of about 5° to 8°.

 

Tapping

In tapping, a tap drill slightly larger than the standard drill recommended for conventional threads should be used, because the metal will probably flow into the cut. It is suggested that on automatic machines, a two or three fluted tapping tool should be used. For taps below 3/16", the two fluted would be best. Grind the face hook angle to 8° to 10°, and the tap should have a .003" to .005" chamfered edge. If possible, if binding occurs in the hole in tapping, the width of the land may be too great, and it is suggested that the width of the heel be ground down. Again, it is suggested that nitrided or electrolyzed tools be used. Speed should be about 20/FPM.

 

High Speed Tool*

Turning
And
Forming

Cut-Off
Tool

1/16"

SFM
FEED

65
.0010

1/8"

SFM
FEED

67
.0012

1/4"

SFM
FEED

69
.0016

Tool
Width

1/2"

SFM
FEED

67
.0012

1"

SFM
FEED

63
.0010

1-1/2"

SFM
FEED

63
.0009

Drilling

Drill
Dia.

3/8"

SFM
FEED

43
.0030

3/4"

SFM
FEED

45
.0036

Reaming

Under 1/2"

SFM
FEED

57
.003

Over 1/2"

SFM
FEED

57
.0045

Threading

T.P.I

3-7½
8-15

SFM
SFM

8
10

Over 16

SFM

16

Tapping

T.P.I

3-7½
8-15
16-24

SFM
SFM
SFM

6
7
11

Over 25

SFM

16

Milling

 

SFM
FEED

35-70
.002-.005

Broaching

 

SFM
FEED

8-12
.001-.005

Turning
Single Point
& Box Tools

High Speed Tools

SFM
FEED

60-65
.0029-.0043

Carbide Tools

SFM
FEED

160-215
.025-.080

 

When using carbide tools, surface speed feet/minute (SFM) can be increased between 2 and 3 times over the high speed suggestions. Feeds can be increased between 50 and 100%.

 

Note: Figures used for all metal removal operations covered are average. On certain work, the nature of the part may require adjustment of speeds and feeds. Each job has to be developed for best production results with optimum tool life. Speeds or feeds should be increased or decreased in small steps.

 

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes.

 

Typical Mechanical Properties

Typical Mechanical Properties of Strip

Tested parallel to the direction of rolling. Material annealed 1830°F for 30 minutes, then furnaced cooled.

Yield
Strength

Tensile
Strength

% Elongation
in 2"

Hardness
Rockwell B

ksi

MPa

ksi

MPa

50

345

75

517

30

68

 

FAQ

1  Q:Do you accept the sample order?

    A: Yes, we accept the sample order. If you order the small piece in stock, it is free. But we do not

         pay for the freight cost.

 

2  Q: How long is your delivery time?

    A:  Usually 45 to 60 days after your down payment, it also according to the material requirement.

 

3  Q: What is your terms of payment.

    A: Payment less or equal 10000USD,100% T/T in advance. Payment more than 1000USD, 30% T/T

         in advance, balance before shippment.

 

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