Alloys 200 and 201

Alloy 200 (UNS N02200) is an unalloyed wrought nickel. It offers excellent corrosion resistance, good mechanical, magnetic conductivities.and magnetostrictive properties and useful thermal and electrical conductivities.
 
Alloy 201 (UNS N02201), with reduced carbon content (0.02% max), shows better corrosion resistance at elevatedtemperatures above 300°C (570°F) by avoiding graphite precipitation.
 
This alloys are characterised by:
•  excellent corrosion resistance in many alkaline media
good mechanical properties within a wide range of temperatures
•  magnetization decreasing continuously between -273 and 360°C (-458 and 680°F) and showing paramagnetism above the
 

Curie point

 
Designation and Standards
Country
National Standards

Material
Designation
Specification
Chem.
composition

Tube and Pipe

Sheet
and plate
Rod
and bar
Strip Wire Forgings
seamless welded
France
AFNOR
                 

Germany



DIN
VdTUV2)

W-Nr. 2.4066
Ni 99.2
W-Nr. 2.4068
LC-Ni 99





17740
345





17751
345





177511)





17750
345





17752
345





17750
345





17753





17754
345

United
Kingdom
BS

NAI I
NA12

  3074  

3072


3076
3073 3075  

USA

ASTM
ASME
AMS

UNS N02200
N02201



B161/163
SB161/163


B725/730



B162
SB162
55532)



B160
SB160



B162
SB162
55532)
 

B564
SB564
ISO

Ni 99.0
LC-Ni 99.0

               
I) Ni 99.2 only 2) LC-Ni 99 only
Page 2
Chemical Composition(%)
Alloy 200 Ni Fe C Mn Si Cu Mg Ti Si
min 99.2 - - - - - - - -
max - 0.4 0.10

0.3

0.1 0.25 0.05 - 0.005
 
Alloy 201 Ni Fe C Mn Si Cu Mg Ti Si
min 99.2 - - - - - - 0.01 -
max - 0.4 0.02

0.3

0.1 0.25 0.05 0.10 0.005
 
Mechanical Properties
The following mechanical properties are applicable to Alloys 200 & 201 n the indicated forms and size ranges and in the annealed
condition (unless otherwise specified). Material outside these size ranges with agreed properties is subject to special enquiry.
 

Sheet and plate

up to 50mm 2 in
Strip 0.3 to 3mm 0.012 to 0.12 in
Rod and bar  up to 250mm 10 in
Forgings up to 150mm 6 in
Tube and pipe wall 1 to 12.5mm 0.04 to 0.5 in

 Diameter

6 to 275mm 0.25 to I I in
 
  According to spec. Condition Tensile strength 0.2%Yield Strength 1.0%Yield Strength Elong A5
%
N/mm2 ksi N/mm2 ksi N/mm2 ksi
Alloy200 DIN 17750-54

annealed

³380 ³55 ³100 ³14.5 ³125 ³18.1 ³40
ASTM B 160-163,
725,730
annealed ³380 ³55 ³105 ³15 - - ³40
stress rel. ³450 ³65 ³275 ³40 - - ³15
Typical values
annealed 440 63.8 150 21.8 180 26.1 44
Alloy201 DIN 17750-54, VdTUV 345
annealed ³340 ³49.3 ³80 ³11.6 ³105 ³15 ³40
ASTM B 160-163,
725,730
annealed ³345 ³50 ³80 ³12 - - ³40
stress rel. ³415 ³60 ³205 ³30 - - ³15
Typical values annealed 415 60 125 18.1 150 21.8 47

Some standards show greater deviations for 0.2% yield values Mechanical properties at room temperature

Please Note: The figures quoted are intended for guidance only. For further information, please refer to the standards listed or contact our sales or QA Departments
 
Metallurgical Structure

Alloys 200 and 201 have face- centred cubic structures between temperatures close to absolute zero and melting point.

 
Corrosion Resistance

Alloys 200 and 201 have excellent resistance to many corrosive media from acid to alkaline. They are most useful under reducing conditions but, where a passive oxide is formed, they may also be used in oxidizing conditions.

Their most significant property is extremely high resistance to caustic alkalies up to and including the molten state. The extra-low carbon content of Alloy 201 gives virtual immunity to intergranular attack above about 3 15'C (6007). The presence of chlorates must be kept to a minimum, as they accelerate the rate of attack.

 

The resistance of Alloys 200 and 201 to mineral acids varies according to temperature and concentration and whether or not the solution is aerated. Corrosion resistance is better in deaerated acid.

 
In acid, alkaline and neutral salt solutions, Alloys 200 and 201 show good resistance, but severe attack occurs in oxidising salt solutions. Both alloys are resistant to all dry gases at room temperature. The low-carbon alloy can be used in dry chlorine and hydrogen chloride - at temperatures up to 550°C (1020°F).
 
Applications

Unalloyed wrought nickel combines excellent mechanical properties with good corrosion resistance. Above 300°C (570°F) working temperature, the low carbon version is efficient. The limited carbon content lowers mechanical, values and work-hardening rate but promotes ductility.

 
Typical applications include:

food production, such as handling of cooling brines, fatty acids and fruit juices - resistance to acid, alkaline and neutral salt solutions and to organic acids

Page 3
Typical applications continued :
valve seals, pump sleeves and wear rings in marine environments - high strength and resistance to seawater
storing and transportation of phenol - immunity from any form of attack ensures absolute product purity
manufacture and handling of sodium hydroxide, particularly at temperatures above 300°C (5707). Typical industries where sodium hydroxide is used are the:
  - production of viscose rayon and manufacture of soap – general corrosion resistance and virtual immunity to intergranular attack above 315'C (600'F)
  - production of hydrochloride and chlorination of hydrocarbons such as benzene, methane and ethane - resistance at elevated temperatures to dry chlorine and hydrogen chloride
  - manufacture of vinyl chloride monomer - resistance to hydrogen chloride at elevated   temperatures
Stock Size Range
Alloy 200/201 - Bar, Tube, Pipe and Fittings
Bar
mm dia
Tube
mm o/d
Pipe
nb
Seamless fittings
nb
6.35 - 152.4 6.35 - 25.4 1/2" - 6" 1/2" - 6"
 
Alloy 200/201 - Sheet and Plate
Size 2m x 1m 8'x 4' 2.5m x 1.25m 3m x 1.2m 3m x 1.5m
Thickness 1.6mm 3, 4, 5, 6mm 11/2 3, 2mm 2,3, 4,5, 6mm
 
Size 10' x 5' 4m x 2m 6m x 2m 6.096m x 2.438m
Thickness '/2", 3/4", I", 11/4" 2,3,4,5,6,8,10mm - -
The above tables represent our standard stock range.
Other sizes can be manufactured to order, often with short lead times

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