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Beryllium Copper Sheet

Beryllium copper sheet is an alloy that has been selected for applications where a component must be capable of multiple spring returns and remain conductive. It starts life soft enough to stamp, then a short low temperature bake turns it into something close to spring steel, while it stays non magnetic and does not throw sparks. C17200 is the grade most buyers ask for, supplied to ASTM B194. The production of beryllium copper sheet is carried out at Sachin Steel Centre in Mumbai, with a mill test certificate issued for each lot.

This page covers the alloy itself: grades, composition, tempers, properties, and heat treatment. For the individual forms, see our beryllium copper products range.

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Table Of Content

Technical Data

Beryllium Copper Specification

Field

Detail

Standard

ASTM B194, ASME SB194; general requirements ASTM B248

Lead grade

UNS C17200 sheet (Alloy 25, CDA 172, CuBe2, DIN 2.1247)

Other grades

C17500 sheet, C17510 sheet

Tempers

Annealed (TB00, A), cold worked (TD01 to TD04), age hardened (TF00, TH01 to TH04), mill hardened (TM series)

Thickness

About 0.15 mm to about 4.8 mm

Width and length

Stock and cut sizes confirmed on quotation

Certification

Mill test certificate per lot

Beryllium Copper Sheet Grades: Two Families

Family

UNS / Names

Character

Typical Use

High strength

C17200 (Alloy 25, CuBe2); C17300 (lead bearing, mainly rod and bar)

Highest strength of the copper alloys after age hardening; about 22% IACS minimum when aged

Springs, contacts, diaphragms, flexures, formed connector parts

High conductivity

C17500 (Cu Co Be); C17510 (Cu Ni Be)

Moderate strength, about 690 to 900 MPa aged, with roughly 45 to 60% IACS

Current carrying parts, welding related and thermal components

Chemical Composition of Beryllium Copper Sheet 

Alloy

UNS

Beryllium

Cobalt / Nickel

Copper

Alloy 25 / CuBe2

C17200

1.80 – 2.00%

Co + Ni 0.20% min (Co + Ni + Fe 0.60% max)

Balance

Cu Co Be

C17500

0.40 – 0.70%

Co 2.4 – 2.7%

Balance

Cu Ni Be

C17510

0.20 – 0.60%

Ni 1.4 – 2.2%

Balance

Tempers and Mechanical Properties of Beryllium Copper (C17200)

Temper

Condition

Typical Tensile

Typical Hardness

When to Choose

TB00 (A)

Solution annealed, soft

About 410 – 540 MPa

About HRB 45 – 78

Deep forming, stamping or machining, then age harden

TD01 – TD04

Cold worked (quarter hard to hard)

About 515 – 830 MPa

About HRB 68 – 102

Moderate forming, springs where post aging is not used

TF00 (AT)

Age hardened from annealed

About 1140 – 1345 MPa

About HRC 36 – 41

Parts formed soft then hardened

TH01 – TH04 (HT)

Age hardened from cold worked

About 1205 – 1550 MPa

About HRC 39 – 45

Maximum strength and fatigue life

TM series

Mill hardened, supplied pre hardened

In the age hardened range

In the age hardened range

Used without further heat treatment, with reduced formability

Physical Properties of Beryllium Copper (C17200)

Property

Typical Value

Density

About 8.25 g/cm³

Modulus of Elasticity

About 128 GPa

Electrical Conductivity

About 22% IACS minimum when age hardened

Melting Range

About 865°C – 980°C

Magnetic and Sparking

Non magnetic and non sparking

Applications of Beryllium Copper

  • Aerospace Components: BeCu sheet is used for aerospace connectors, instruments, springs, and precision components requiring high strength and conductivity.
  • Non-Sparking Tools: Non sparking copper sheet is used for selected tools and components in environments where spark generation must be minimized.
  • Electrical Equipment: ASTM B194 beryllium copper sheet is used for terminals, contacts, shields, and switchgear components.
  • Industrial Applications: C17500 sheet and C17510 sheet are used for components requiring thermal and electrical conductivity with mechanical strength.
  • Heat Transfer: Beryllium copper strip is used for heat-transfer components, mould inserts, and precision tooling.
  • Springs: Alloy 25 sheet, CuBe2 sheet, and spring copper sheet are used for springs, clips, diaphragms, and precision components requiring fatigue resistance.
Application Industries

Frequently Asked Questions

What is the difference between C17200 and C17500 beryllium copper sheets?

C17200 beryllium copper sheet offers higher strength, while C17500 sheet provides higher electrical and thermal conductivity. Both are precipitation-hardened copper alloys.

What is the difference between Alloy 25, CuBe2, and C17200?

Alloy 25 sheet, CuBe2 sheet, and UNS C17200 sheet identify the same high-strength beryllium copper alloy using different commercial, chemical, and designation systems.

What is the difference between annealed and age-hardened beryllium copper sheet?

Annealed beryllium copper sheet is softer and easier to form. Age-hardened C17200 beryllium copper sheet provides higher strength after controlled heat treatment.

Can beryllium copper sheet be formed before it is hardened?

Yes. C17200 beryllium copper sheet is commonly formed in the annealed condition before age hardening. This provides better formability before achieving higher strength.

Is beryllium copper sheet magnetic or sparking?

Beryllium copper sheet is non-magnetic and commonly used as a non-sparking copper sheet for selected tools and components where spark generation must be minimised.

Which ASTM standard covers beryllium copper sheet?

ASTM B194 covers wrought copper-beryllium alloy plate, sheet, strip, and discs. ASTM B194 beryllium copper sheet includes grades such as C17200.

Is beryllium copper sheet safe to handle and machine?

Solid BeCu sheet is generally suitable for normal handling. Machining, grinding, welding, and heating require dust or fume controls because beryllium exposure can be hazardous.

What thicknesses and sizes are available, and can it be cut to size?

Beryllium copper sheet is available in various thicknesses and dimensions. A beryllium copper sheet manufacturer, supplier, stockist, or exporter can provide cut-to-size material.

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