TOBO STEEL GROUP CHINA
TOBO ALLOY GROUP TOBO Alloy Group is a mature, steady and energetic high-tech company, specializing in manufacture of high-temperature alloys and corrosion resistant alloys, such as Hastelloy, Haynes,
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Stainless Steel Pipe Tube Press Reducing Tee Permalloy 4J28 Tee SGS Certification
1.Introduction
4J28 is glass-to-metal sealing and iron-chromium alloy. Nominally 28 % chromium, in strip, bar, wire, and
rod forms intended primarily for sealing to glass in electronic applications. UNS K92801 should only be
considered for use at service temperatures below 300°C. The alloy is prone to sigma phase formation at
temperatures close to 620°C, and exhibits brittle mechanical behavior after prolonged exposures at
temperatures close to 475°C.
2.Chemistry composition (%)
Some chemical properties of permalloy 4J28 include:
| C | P | S | Mn | Si | Ni | N | Cr | Fe |
| ≤ | ||||||||
| 0.12 | 0.02 | 0.02 | 1 | 0.7 | 0.5 | 0.2 | 27.0~29.0 | Balance |
Notes:
1.Under condition that the average coefficient of the linear expansion meets the requirements of the
standard, the content of chromium is allowed to deviate from the stated range.
2.The shape and dimensions of the alloys are in compliance with GB/T14985.
3. Typical properties
Table 1:
| Heat Treatment for sample | Average Coefficient of Linear Expansion | |||||||
| 20~530°C | ||||||||
| Heat to 1100±20°C, hold for 15min., cool to room tempreture in the air. | 10.8~11.4 | |||||||
Note:
The hardness of the annealed strip should be no more than 170. Hardness inspection is not required
when the thickness of the strip is less than 0.2mm.
Table 2:
| Average Coefficient of Linear Expansion ã/(10-6/K) | |||||||
| 20~200 ℃ | 20~300 ℃ | 20~400℃ | 20~450℃ | 20~500℃ | 20~600℃ | 20~700℃ | 20~800℃ |
| 10 | 10.5 | 10.8 | - | 11.1 | 11.2 | 11.6 | 11.6 |
5.Specification
6.Size Range
*Sheet---Thickness 0.1mm~3.5mm, width:≤300mm,Condition: cold rolled, bright, bright annealed
*Plate---Thickness 3.5mm~40.0mm,width:≤300mm,Condition: cold rolled, hot rolled, annealed
*Round Wire---Dia 0.1mm~Dia 5.0mm,Condition: cold drawn, bright, bright annealed
*Flat Wire---Dia 0.5mm~Dia 5.0mm,length:≤1000mm,Condition:flat rolled, bright annealed
*Bar---Dia 5.0mm~Dia 8.0mm,length:≤2000mm,Condition:cold drawn,bright, bright annealed
Dia 8.0mm~Dia 32.0mm,length:≤2500mm,Condition:hot rolled,bright, bright annealed
Dia 32.0mm~Dia 180.0mm,length:≤1300mm,Condition:hot forging,peeled, turned, hot treated
*Capillary---OD 8.0mm~1.0mm,ID 0.1mm~8.0mm,length:≤2500mm,Condition: cold drawn, bright, bright
annealed
*Pipe---OD 120mm~8.0mm,ID 8.0mm~129mm,length:≤4000mm,Condition: cold drawn, bright, bright
annealed
We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicians. We have five branch factories which can supply the best quality pipes, tubes, fittings flanges and related accessories.
More than 120 top-class mills
A number of advanced equipments
Company with a variety of detection devices
We have five branch factories
If the quantity of order is not very big,we could send them to you by express delivery,such as TNT,DHL,UPS OR EMS etc.
If order is big ,we will advise you use Air Shipping or Sea Shipping through your nominated forwarder agent.Our long-term cooperated agent also available.
We are manufacturer ,You can see the Alibaba certification.
Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
Yes, we could offer the sample for free charge but need pay the cost of freight.
Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
Package:Standard export carton packing.
Delivery time:stock-45 days after confirming order,detail delivery date should be decided according to production season and order quantity.