Datasheet updated

2025-01-09 10:10
(supersedes all previous editions)


Nickel alloys
Extend your possibilities

Extend your possibilities

We are expanding our high-performance family of Sanicro® nickel alloys to give you more options for bar and hollow bar. Ideal for machining critical components, this portfolio builds on our 60-year legacy of providing high-performance tube in similar grades. In 2021, we introduced Sanicro® 825 bar and hollow bar, and we’ll continue to roll out new corrosion-resistant alloys to help reduce machining costs, simplify welding and fabrication.

Solid Bar

Sanicro®625 is an extremely versatile nickel-chromium-molybdenum-niobium alloy, suitable for use in severely corrosive environments requiring high strength materials.

Service temperatures ranging from cryogenic to 593°C (1100°F).

Grade characteristics

Excellent

  • Corrosion resistance in widely varying acidic
    and chloride containing environments
  • Resistance to general corrosion, pitting, and crevice corrosion
  • Resistance to corrosion in hydrogen sulfide environments

Extremely good

  • Resistance to chloride-induced stress corrosion cracking

Very high

  • Strength within the recommended service temperatures

Very good

  • Welding properties

Material designations

  • ASTM: UNS N06625 Grade 1
  • UNS: N06625
  • EN Number: 2.4856 

Product standards

  • ASTM B-446 (Grade 1) / ASME SB-446 (Grade 1)
  • ANSI/NACE MR0175 / ISO 15156-3
  • ANSI/NACE MR0103 / ISO 17945-1
  • ISO14067:2018 (CO2e)

Chemical composition and mechanical properties only

ASTM B-564 / ASME SB-564

Approvals

  • Pressure Equipment Directive / PED (2014/68/EU)
  • Pre-approval for PMA, D≤254 mm
  • Approved by the American Society of Mechanical Engineers (ASME) for use in accordance with ASME Boiler and Pressure Vessel Code, Section I, Section III Div. 1 classes 1 and 3, Section VIII div.1.

Climate change impact

Carbon footprint / CO2e data (kg/ton) and Life Cycle Assessment report is available for these products in the range of D 75-230 mm (D3.00”-9.05”).

Material Test Certificate

According to EN 10204/3.1

Chemical composition (nominal)

Chemical composition (nominal) %
C Si Mn P S Cr Ni Mo Fe Nb Co Ti Al
<0.025 <0.50 <0.50 <0.015 <0.015 21 62 8.5 <5 3.5 <1.0 0.2 <0.40

Pitting Resistance Equivalent Number, (PRE) >48.

Applications

Examples of applications for Sanicro® 625

Environmental projects

  • Waste-to-Energy production
  • Pollution control equipment
  • Refuse-derived fuel plants

Renewable energy

  • Solar power plants
  • Geothermal power
  • Bio-fuel production

Oil & Gas / Refinery

  • Well construction and service
  • Gas lift equipment
  • Wellheads and Christmas trees

Chemical processing

  • Phosphoric acid production
  • Pickling operations

Marine applications

  • Drivetrain components
  • Offshore piping systems
  • Seawater coolant in industries

Corrosion resistance

General corrosion


Sanicro®625 offers excellent resistance to both reducing, oxidizing, and in mixed corrosive environments. The resistance to marine corrosion / sea water is particularly good.

Intergranular corrosion


Sanicro®625 is stabilized against intergranular attack by the niobium content,
and the extra low carbon content. The resistance to IGC is tested acc. to ASTM G-28 Method A (Streicher test). Criteria: Max. 3mm / year.

Stress Corrosion Cracking


The nickel content of Sanicro®625 is at 62 % which promotes an excellent resistance to stress corrosion cracking induced by both chlorides and alkalis.
This makes it virtually immune to chloride-induced SCC, and the resistance to cracking in the presence of H2S and chlorides is very high. According to NACE MR 0175 / ISO 15156-3 it is acceptable for use in the oil and gas industry with no environmental limits in respect of partial pressures of H2S or elemental sulfur.

Pitting and crevice corrosion


Sanicro®625 have an extraordinary resistance to pitting and crevice corrosion in seawater at a variety of temperatures. With PRE number ≥48, Sanicro®625 is one of the grades which is least susceptible to these types of corrosion.

Forms of supply

Diameters and finished condition

Sanicro®625 is stocked in imperial dimensions.
Diameter range: 76.2mm-228.6mm (3”-9”)
Delivery condition: Soft annealed, peel-turned and ground to final finish.

Lengths

Bars are delivered in random lengths of 3-6.9 m, depending on diameter.

Straightness, metric units

Height of arch, 2 mm/m

Tolerances, metric units

Diameter tolerances: -0 / +0.79 mm
Surface finish: Ra, max. 3µm

Heat treatment

The Sanicro®625 stock program bars are delivered in soft annealed and quenched condition. Annealing at min. 910°C (1670°F) followed by quenching in water.

Mechanical properties

Tensile strength

Min. values at room temperature:

Dimension Proof strength Rp0.2 Tensile strength Rm Elongation A5
D≤101.9mm  415 MPa / 60 ksi 830 / 120 ksi 30%
D>101.9mm 345 MPa / 50 ksi 760 / 110 ksi 30%

Impact strength

-60°C Min. values Longitudinal Transversal (D>60mm)
Average 68J 47J
Single 61J 41J

Hardness

Hardness in the delivery condition is max. 35 HRC.

Physical properties

Density, at 20°C: 8.4 g/cm3, 0.31 lb/in3

Thermal conductivity

Temperature, °C W/(m °C) Temperature, °F Btu/(ft h°F)
20 9.8 68 5.7
100 10.8 200 6.2
200 12.5 400 7.2
300 14.1 600 8.2
400 15.7 800 9.1
500 17.5 1000 10.1
600 19 1200 11
700 20 1400 12
800 22.8 1600 13.2
900 25.2 1800 14.6

Specific heat capacity

Temperature, °C J/(kg °C) Temperature, °F Btu/(lb °F)
20 410 68 0.10
100 427 200 0.10
200 455 400 0.11
300 475 600 0.12
400 505 800 0.12
500 525 1000 0.13
600 550 1200 0.14
700 575 1400 0.14
800 600 1600 0.15
900 625 1800 0.15

Thermal expansion, mean values in temperature ranges (x10-6)

Temperature, C Per °C Temperature, °F Per °F
30-100 12.5 86-200 7
30-200 13 86-400 7.5
30-300 13.5 86-600 7.5
30-400 13.5 86-800 7.5
30-500 14 86-1000 8
30-600 14 86-1200 8
30-700 15 86-1400 8.5
30-800 15.5 86-1600 9
30-900 16 86-1800 9

Resistivity

Temperature, °C µΩm Temperature, °F µΩin.
20 1.30 68 51.2
100 1.32 200 52.0
200 1.34 400 52.8
300 1.35 600 53.2
400 1.36 800 53.5
500 1.37 1000 54.3
600 1.38  1200 54.3 
700 1.38 1400  54.0 
800 1.38 1600  53.5
900 1.38 1800  53.1 

Modulus of elasticity (x103) (annealed condition)

Temperature, °C MPa Temperature, °F ksi
 20  208  68  30
 100  203  200  29.5
 200  198  400  28.5
 300  193  600  28
 400  187  800  27
 500  181  1000  26
 600  174  1200  24.5
 700  166  1400  23.5
 800  156  1600  21.5

Modulus of elasticity (x103) (solution annealed condition)

Temperature, °C MPa Temperature, °F ksi
 20  205  68  29.5
 100  200  200  29
 200  194  400  28
 300  188  600  27
 400  182  800  26
 500  176  1000  25
 600  169  1200  24
 700  162  1400  23
 800  154  1600  21.5

Welding

The weldability of Sanicro® 625 is good. Suitable methods of fusion welding are manual metal-arc welding (MMA/SMAW) and gas-shielded arc welding, with the TIG/GTAW method as first choice.

For Sanicro® 625, heat-input of <1.2 kJ/mm and interpass temperature of <100°C (210°F) are recommended. A string bead welding technique should be used.

Recommended filler metals

TIG/GTAW or MIG/GMAW welding:
ISO 18274 S Ni 6625/AWS A5.14 ERNiCrMo-3 (e.g. Exaton Ni60)

MMA/SMAW welding:
ISO 14172 E Ni 6625/AWS A5.11 ENiCrMo-3 (e.g. Exaton Ni60)

Machining

General

Machining is an expression used for a number of subtractive manufacturing methods. Mainly turning, milling, drilling. But also other operations like cutting, boring, grinding, reaming and tapping.

For solid bars the initial operations primarily are cutting and external turning to prepare a blank for component manufacturing.

Nickel alloys

Materials within the ISO-S material area are challenging to machine.

The materials vary a lot within the ISO-S group, but in general presents difficult chip control, high cutting forces and tool wear.

In order to get as efficient function and tool life as possible, dedicated cutting tools and strategies to be used.

Getting started

To get it right, the first thing is to know the material to be machined.

As the material properties are input to the selection of start values.

  • ISO material group
  • Condition/heat treatment
  • Actual hardness of the material lot

Consult your cutting tool supplier for start recommendations, since the choice of cutting tools and machine tool set the direction for which start values to use.


Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.

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