Question 1

What is C18200 / CuCr1 chromium copper used for?

Accepted Answer

C18200 / CuCr1 is the standard high-conductivity copper alloy for applications requiring both electrical or thermal conductivity and mechanical strength. Key applications in UAE and global markets include: resistance welding electrodes, tips, caps, and holders for spot, seam, and projection welding machines - the most widespread application globally; water-cooled induction heating coil tubes for induction hardening and brazing equipment; plastic injection mould inserts and core pins where high thermal conductivity reduces cycle times; die casting plunger tips and shot sleeves; bus bars and high-current electrical switchgear contacts; continuous casting mould liners; and aerospace electrical bonding components per AMS 4633. Its ability to maintain greater than 80% IACS electrical conductivity while achieving hardness of 68-80 HRB in the TH04 condition makes it the irreplaceable choice wherever both properties must be achieved simultaneously.

Question 2

What is the EN / DIN equivalent of C18200?

Accepted Answer

The European equivalent of C18200 is CuCr1, with EN code CW105C and DIN Werkstoff-Nr. 2.1291, per BS EN 12163. The ISO designation is ISO 1337 CuCr1. AMS 4633 is the aerospace material specification for C18200 rod and bar. In UAE and GCC procurement, C18200, CuCr1, and 2.1291 are used interchangeably. Note that C18150 (CuCrZr, DIN 2.1293) is a distinct grade with higher strength due to the zirconium addition - always verify the grade designation on the MTC to confirm which alloy has been supplied.

Question 3

What is the difference between C18200 (CuCr1) and C18150 (CuCrZr)?

Accepted Answer

C18200 (CuCr1) contains chromium only (0.60-1.20% Cr). C18150 (CuCrZr, CW106C, 2.1293) contains both chromium (0.50-1.50% Cr) and zirconium (0.03-0.30% Zr). The zirconium addition in C18150 provides: higher TH04 strength (UTS up to 550 MPa vs 380-450 MPa for C18200); better retention of hardness at elevated temperatures; and greater resistance to softening during brazing operations. C18150 is preferred for the most demanding resistance welding electrode applications and mould inserts subject to high mechanical loading. C18200 is adequate for standard resistance welding and general electrical engineering applications and is more widely available at lower cost.

Question 4

What condition is C18200 / CuCr1 normally supplied in?

Accepted Answer

Nifty Alloys supplies C18200 in TH04 (precipitation hardened) condition as standard stock - the optimum condition for resistance welding electrodes, mould inserts, and most electrical engineering applications. TH04 means the material has been solution annealed, cold worked to half hard (H04), and precipitation hardened by aging at 450-480 degrees C. It achieves conductivity greater than 80% IACS, hardness 68-80 HRB, and UTS 380-450 MPa. Solution annealed (M) condition is available for customers who need to form, draw, or machine extensively before final aging. All forming should be done in the M condition before aging to TH04 properties.

Question 5

What electrical conductivity does C18200 achieve and how is it verified?

Accepted Answer

C18200 / CuCr1 achieves electrical conductivity exceeding 80% IACS (International Annealed Copper Standard) in the TH04 precipitation-hardened condition. Conductivity is measured by eddy current conductivity meter and confirmed on the EN 10204 3.1 Mill Test Certificate - this is a mandatory test for C18200 supply, not an optional addition. For comparison: pure copper is 100% IACS; C18150 (CuCrZr) is also greater than 80% IACS; beryllium copper (C17200) is only 20-25% IACS. Thermal conductivity of C18200 TH04 is approximately 320 W/m.K - approximately 80% of pure copper (400 W/m.K), which explains its effectiveness in heat-dissipating mould inserts and welding electrodes.

Question 6

What sizes of C18200 / CuCr1 are available in UAE?

Accepted Answer

Nifty Alloys stocks C18200 / CuCr1 from our Dubai warehouse in: Round Bar: 6-250 mm diameter (TH04 condition; M condition on request). Flat Bar / Rectangular Bar: 5-100 mm thickness, widths up to 300 mm. Plate / Block: 10-150 mm thickness, cut-to-size. Tube: seamless, OD 10-100 mm, wall thickness 1.5-10 mm per ASTM B441 (available on indent). For non-standard sizes, M condition, large-section blocks, or AMS 4633 certified material, contact our technical team.

Question 7

Is C18200 chromium copper available from stock in Dubai / UAE?

Accepted Answer

Yes - C18200 / CuCr1 TH04 condition round bar and flat bar are held in stock at our Dubai, UAE warehouse. Delivery within UAE takes 24-48 hours. We export to Saudi Arabia, Kuwait, Qatar, Oman, and Bahrain within 3-5 working days. Solution annealed (M) condition and tube are available on short indent from our European mill sources. AMS 4633 certified material is available from our qualified mill sources - specify at enquiry stage. Contact Nifty Alloys for same-day stock confirmation and quotation.

Question 8

What certifications are supplied with C18200 from Nifty Alloys?

Accepted Answer

All C18200 / CuCr1 supplied by Nifty Alloys is accompanied by EN 10204 3.1 Mill Test Certificates as standard, confirming chemical composition, mechanical properties (UTS, hardness), AND electrical conductivity (minimum 80% IACS for TH04 condition - this conductivity confirmation is included on every MTC for C18200). EN 10204 3.2 third-party inspection is available on request. AMS 4633 certified material is available from our qualified mill sources for aerospace and precision engineering procurement - advise at enquiry stage.

Question 9

How do I age C18200 if I receive it in the solution annealed (M) condition?

Accepted Answer

If you receive C18200 in the solution annealed (M) condition: (1) Complete all forming, drawing, and rough machining first in the soft M condition. (2) Optionally cold work to approximately 50% reduction (H04 temper) before aging to produce higher TH04 strength. (3) Age at 450-480 degrees C for 2-4 hours in a controlled atmosphere furnace (inert gas or reducing atmosphere preferred to prevent surface oxidation). (4) Air cool from aging temperature. (5) Verify conductivity with an eddy current meter - should read greater than 80% IACS. If below target, extend aging time by 1 hour and re-measure. Do NOT exceed 500 degrees C as over-ageing reduces both strength and conductivity. Avoid the 250-400 degrees C range during heating and cooling as it produces suboptimal partial precipitation.

Question 10

Why is C18200 chromium copper preferred over pure copper for resistance welding electrodes?

Accepted Answer

Pure copper (C10100 ETP) has the highest conductivity (100% IACS) but very low hardness (40-50 HRB) and poor wear resistance. In resistance welding, the electrode tip is subject to repeated impact at high contact pressure and rapid thermal cycling - pure copper deforms, mushrooms, and wears rapidly, requiring frequent tip dressing and replacement. C18200 CuCr1 TH04 maintains conductivity above 80% IACS while providing hardness of 68-80 HRB - approximately twice the hardness of pure copper. This results in electrode life typically 2-5 times longer than pure copper tips, significantly reducing downtime and electrode consumption in high-volume automotive and sheet metal welding operations in UAE and globally.

Standard	Designation	Notes
UNS	C18200	—
EN Name	CuCr1	EN / DIN chemical name
EN / Werkstoff	CW105C	EN code (CEN designation)
EN / Werkstoff	2.1291	Werkstoff-Nr. (DIN)
ASTM	B196 Alloy C18200	ASTM bar/rod specification
ASTM	B441 Alloy C18200	ASTM tube specification
AMS	AMS 4633	C18200 rod and bar - aerospace / precision engineering procurement reference
ISO	ISO 1337 CuCr1	—
Common Name	Chromium Copper	—
Common Name	Copper Chromium (CuCr)	Common name variant

Standard	Status	Notes
EN 10204 3.1	Suitable	Standard with all supply - confirms chemical composition, mechanical properties, AND electrical conductivity (minimum 80% IACS for TH04 condition).
EN 10204 3.2	Conditional	Independent third-party inspection. Available on request for critical applications. NACE MR0175 not applicable as a primary specification. AMS 4633 compliance available for aerospace procurement - specify at order stage.

Property	C18200 / CuCr1 / 2.1291 — ASTM B196 / B196M — Precipitation Hardened TH04Default	C18200 / CuCr1 / 2.1291 — ASTM B196 / B196M — Solution Annealed
Tensile Strength (UTS)range	380–450 MPaTypical: 415 MPaCondition: Room temp, longitudinalNotes: Per ASTM B196 TH04. Values for rod and bar.	220–270 MPaTypical: 245 MPaCondition: Room temp, longitudinalNotes: Per ASTM B196 M condition. Much lower than TH04 - customer must age to achieve full properties.
Yield Strength (0.2% Proof Stress)range	310–380 MPaTypical: 340 MPaCondition: Room tempNotes: 0.2% offset.	70–140 MPaTypical: 105 MPaCondition: Room tempNotes: Very low yield - maximum formability in soft condition.
Elongationmin	10 %Typical: 15 %Condition: 50 mm gauge lengthNotes: Adequate ductility after precipitation hardening.	25 %Typical: 35 %Condition: 50 mm gauge lengthNotes: High elongation - excellent formability for drawing and cold working.
Hardnessrange	68–80 HRBTypical: 74 HRBCondition: Rockwell BNotes: TH04 target range. Approximately 125-150 HB equivalent.	50–65 HRBTypical: 57 HRBCondition: Rockwell BNotes: Soft condition. Significantly lower than TH04.
Electrical Conductivitymin	80 % IACSTypical: 85 % IACSCondition: 20 degrees C, eddy current per ASTM E1004Notes: CRITICAL PROPERTY - confirmed on MTC. Greater than 80% IACS confirms successful precipitation hardening. Must be stated on every C18200 MTC.	60–75 % IACSTypical: 68 % IACSCondition: 20 degrees CNotes: Chromium in solid solution reduces conductivity. Recovers to greater than 80% IACS after aging at 450-480 degrees C.
Thermal Conductivitymax	320 W/m.KCondition: 20 degrees CNotes: Approximately 80% of pure copper. [VERIFY]	260 W/m.KCondition: 20 degrees CNotes: Lower than TH04 due to Cr in solution. [VERIFY]

Property	C18200 / CuCr1 / 2.1291 — ASTM B196 / B196M — Precipitation Hardened TH04Default	C18200 / CuCr1 / 2.1291 — ASTM B196 / B196M — Solution Annealed
Density20 degrees C	8.89 g/cm3	8.89 g/cm3
Modulus of Elasticity25 degrees C	128 GPa	128 GPa
Thermal Conductivity20 degrees C	320 W/m.K	320 W/m.K
Coefficient of Thermal Expansion20-100 degrees C	17 um/m.degC	17 um/m.degC
Specific Heat Capacity20 degrees C	385 J/kg.K	385 J/kg.K
Melting Point / RangeSolidus	1060 degrees C	1060 degrees C

C18200 / CuCr1 / 2.1291

Applications

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Standard

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Overview

Frequently Asked Questions

What is C18200 / CuCr1 chromium copper used for?

What is the EN / DIN equivalent of C18200?

What is the difference between C18200 (CuCr1) and C18150 (CuCrZr)?

What condition is C18200 / CuCr1 normally supplied in?

What electrical conductivity does C18200 achieve and how is it verified?

What sizes of C18200 / CuCr1 are available in UAE?

Is C18200 chromium copper available from stock in Dubai / UAE?

What certifications are supplied with C18200 from Nifty Alloys?

How do I age C18200 if I receive it in the solution annealed (M) condition?

Why is C18200 chromium copper preferred over pure copper for resistance welding electrodes?

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