Commercially pure titanium, Grade 1 (UNS R50250) CP Ti Grade 1

Unalloyed titanium, UNS R50250 (ASTM Grade 1): maximum limits on O, Fe, C, N and H, titanium the balance · CAS 7440-32-6

Also known as UNS R50250, BS TA1, ASTM B265, ASTM B348, ASTM F67, AMS 4921 · 5 more

Commercially pure titanium Grade 1, UNS R50250, is unalloyed titanium.

8 sources · Updated 2026-11-01 · CC BY 4.0

Evidence level

2 of 5

Lab-measured

Strength

> 240 MPa

Ductility

> 24 %

Stiffness

103 GPa

Density

4.51 g/cm³

Recipe, share of the weight

  • Ti balance (the rest)Titanium
  • O maximum 0.18 %Oxygen
  • Fe maximum 0.2 %Iron
  • C maximum 0.08 %Carbon
  • N maximum 0.03 %Nitrogen
  • H maximum 0.015 %Hydrogen

Best for

Formable, corrosion-resistant parts such as plate heat exchangers and chemical-plant equipment, where ductility matters more than strength (Alleima and Smiths)

Weakest at

Strength: 240 MPa minimum tensile (ASTM B265 Table 1); ATI says CP titanium has limited formability at room temperature

Risk at a glance

  • People Low. Solid: no class. Powder and swarf: flammable
  • If it fails Moderate. Loss of ductility from hydrogen, oxygen, nitrogen or carbon pickup
  • Corrosion Low. Smiths says Grade 1 offers high corrosion resistance in oxidising, neutral and mildly reducing media, including chlorides.

Quick facts: CP Ti Grade 1

Key properties of CP Ti Grade 1
PropertyValueBasis
Density4.51 g/cm³1 sourced value
Yield strength138 to 310 MPa4 sourced values across conditions
Tensile strength240 to 345 MPa3 sourced values across conditions
Young's modulus103 GPa1 sourced value

What is the density of Commercially pure titanium, Grade 1 (UNS R50250)?

Commercially pure titanium, Grade 1 (UNS R50250) has a density of 4.51 g/cm³. The source and test conditions are listed in the properties table on this page.

What is the yield strength of Commercially pure titanium, Grade 1 (UNS R50250)?

Commercially pure titanium, Grade 1 (UNS R50250) has a yield strength of 138 to 310 MPa. The range covers 4 sourced values across the tempers, forms and test conditions the sources report; room-temperature values are used where a source states a temperature.

What is the tensile strength of Commercially pure titanium, Grade 1 (UNS R50250)?

Commercially pure titanium, Grade 1 (UNS R50250) has a tensile strength of 240 to 345 MPa. The range covers 3 sourced values across the tempers, forms and test conditions the sources report; room-temperature values are used where a source states a temperature.

What is the Young's modulus of Commercially pure titanium, Grade 1 (UNS R50250)?

Commercially pure titanium, Grade 1 (UNS R50250) has a Young's modulus of 103 GPa. The source and test conditions are listed in the properties table on this page.

What are the other names and codes for Commercially pure titanium, Grade 1 (UNS R50250)?

Commercially pure titanium, Grade 1 (UNS R50250) is also written as UNS R50250, BS TA1, ASTM B265, ASTM B348, ASTM F67, AMS 4921. Each code is printed in the source listed beside it in the designations table.

What is Commercially pure titanium, Grade 1 (UNS R50250) used for?

Uses recorded in the sources include Plate heat exchangers; Components and equipment for chemical plant and marine service; Airframe skin, structural components and cryogenic vessels (listed for CP Grades 1 to 4 together).

Why it exists

Grade 1 is an unalloyed titanium grade chosen where ductility, formability and corrosion resistance matter more than strength. Alleima describes it as having relatively low strength and high ductility, and says it is typically used for plate heat exchangers. Smiths says it provides optimum ductility and cold formability with useful mechanical strength, and that it resists oxidising, neutral and mildly reducing media, including chlorides.

Where it's used

Plate heat exchangers

Alleima says Ti Grade 1 is typically used for plate heat exchangers. The datasheet describes the grade as having low oxygen content, relatively low strength and high ductility.

Chemical plant and marine equipment

Smiths lists typical applications for Grade 1 that include chemical plant, pharmaceutical, food, oil and gas, and marine industries.

Airframe and cryogenic parts (shared CP range)

ATI lists airframe skin, structural components and cryogenic vessels for its CP grades together. The ATI sheet does not give a Grade 1 specific list.

Recipe

Unalloyed titanium, UNS R50250 (ASTM Grade 1): maximum limits on O, Fe, C, N and H, titanium the balance

Unalloyed titanium with no deliberate alloying additions. ASTM B265 Table 2 limits the Grade 1 composition to maximum oxygen, iron, carbon, nitrogen and hydrogen, with titanium as the balance. Process routes are not described in the sources fetched for this profile.

What CP Ti Grade 1 is made of
IngredientShare of the weightWhat it does
Titanium Ti balance (the rest) Base metal. ASTM B265 gives titanium as the balance after the listed maxima.
Oxygen O maximum 0.18 % Interstitial impurity with a maximum limit. The Alleima datasheet prints a lower nominal limit (see gaps).
Iron Fe maximum 0.2 % Impurity with a maximum limit.
Carbon C maximum 0.08 % Interstitial impurity with a maximum limit.
Nitrogen N maximum 0.03 % Interstitial impurity with a maximum limit.
Hydrogen H maximum 0.015 % Interstitial impurity with a maximum limit.

Weight shares are as printed in the sources.

What it can do

Strength

> 240 MPa

measured

ASTM B265 Table 1 gives a minimum tensile strength of 240 MPa (35 ksi) and a minimum 0.2 % yield strength of 138 MPa (20 ksi) for strip, sheet and plate. Smiths prints typical values of 345 MPa tensile and 221 MPa yield.

Ductility

> 24 %

measured

The ASTM minimum elongation is 24 % in 2 in or 50 mm. Smiths prints a typical elongation of 37 % on 2 in.

Stiffness

103 GPa

measured

Smiths prints a typical elastic modulus of 103 GPa, without stating the loading mode.

Density

4.51 g/cm³

measured

The ATI 30 product page prints a density of 4.51 g/cm3.

Corrosion

Smiths says Grade 1 offers high corrosion resistance in oxidising, neutral and mildly reducing media, including chlorides. No Grade 1 seawater or crevice test was found.

How it compares

Grade 1 is described by Alleima as having relatively low strength and high ductility. Its ASTM B265 minimum tensile strength is 240 MPa, and the Smiths datasheet prints a typical elastic modulus of 103 GPa. The ATI 30 product page prints a density of 4.51 g/cm3. This profile does not compare Grade 1 numerically with other grades, because those grades are recorded in their own profiles. The table below sets out the three values recorded here.

The same measurements for each material, so you can compare them. Each row names the key condition under the value; the full conditions and methods are in the numbered notes under Technical details. Other materials are shown beside it; each was measured under its own conditions, so open its page before comparing closely. Compare every grade in the family.

Benchmarks
MeasurementCP Ti Grade 1CP Ti Grade 2Ti-6Al-4VTi-6Al-4V ELITi-3Al-2.5V (Grade 9)TiAlBeta 3Ti Grade 11Ti Gr 12CP Ti Grade 3CP Ti Grade 7Ti minor alloys
Physical and electrical
Density, bar4.51 g/cm³14.51 g/cm³4.43 g/cm³4.42 g/cm³4.48 g/cm³3.8 g/cm³5.07 g/cm³4.51 g/cm³4.51 g/cm³4.51 g/cm³4.51 g/cm³4.54 g/cm³
Hardness, typical120 HV14160 HV30 HRCno data15 HRCno data24 to 38 HRCno datano data200 HVno data24 to 38 HRC
Other measurements
Tensile strength, minimum, bar> 240 MPa2> 345 MPano data828 MPa> 620 MPa422 MPa1000 MPa> 240 MPa> 483 MPa> 450 MPa> 345 MPa< 175 ksi
Yield strength, minimum, bar> 138 MPa3> 275 MPa830 MPa759 MPa> 483 MPa326 MPa965 MPa> 138 MPa> 345 MPa> 380 MPa> 275 MPa< 186 ksi
Elongation, minimum, barPrinted as 24% min on the ATI 30 product page> 24 %4> 20 %10 %10 %> 15 %1.7 %7 %> 24 %> 18 %> 18 %> 20 %< 10 %
Tensile strength, minimum (strip, sheet and plate)> 240 MPa5> 345 MPano data828 MPa> 620 MPa422 MPa1000 MPa> 240 MPa> 483 MPa> 450 MPa> 345 MPa< 175 ksi
Yield strength, 0.2 % offset, minimum (strip, sheet and plate)> 138 MPa6> 275 MPa830 MPa759 MPa> 483 MPa326 MPa965 MPa> 138 MPa> 345 MPa> 380 MPa> 275 MPa< 186 ksi
Yield strength, 0.2 % offset, maximum (strip, sheet and plate)< 310 MPa7> 275 MPa830 MPa759 MPa> 483 MPa326 MPa965 MPa> 138 MPa> 345 MPa> 380 MPa> 275 MPa< 186 ksi
Elongation, minimum (strip, sheet and plate)> 24 %8> 20 %10 %10 %> 15 %1.7 %7 %> 24 %> 18 %> 18 %> 20 %< 10 %
Tensile strength, typical345 MPa9> 345 MPano data828 MPa> 620 MPa422 MPa1000 MPa> 240 MPa> 483 MPa> 450 MPa> 345 MPa< 175 ksi
Yield strength, 0.2 % offset, typical221 MPa10> 275 MPa830 MPa759 MPa> 483 MPa326 MPa965 MPa> 138 MPa> 345 MPa> 380 MPa> 275 MPa< 186 ksi
Elongation on 2 in, typical37 %11> 20 %10 %10 %> 15 %1.7 %7 %> 24 %> 18 %> 18 %> 20 %< 10 %
Reduction of area, minimum> 30 %12> 35 %no data41.5 %no datano datano datano datano data> 35 %> 30 %no data
Elastic modulus, typical103 GPa13103 GPa113.8 GPa107 to 122 GPa91 GPa168 GPa82 GPa112 GPa103 GPa103 GPa112 GPa15000 ksi
Beta transus, ATI 30 (CP Grade 1)888 °C15913 °C995 °C966 °Cno datano data750 °C888 °C890 °C1690 °Fno data800 °C

Why choose it, and why not

Good for

  • Plate heat exchangers, where Alleima says the grade is typically used.
  • Forming and welding of sheet and plate where ductility matters more than strength (Smiths and ATI).
  • Chemical plant and marine equipment, where corrosion resistance matters (Smiths).

Watch out for

  • Low strength: 240 MPa minimum tensile (ASTM B265), with typical 345 MPa tensile (Smiths).
  • Hydrogen, oxygen and nitrogen pickup lowers ductility and notch resistance (ATI).
  • Powder and swarf are a flammable-solid fire hazard (PubChem).
  • No Grade 1 seawater or crevice test was found in the sources read.

Grade 1 is the unalloyed titanium choice where ductility and formability come before strength. ASTM B265 sets a 240 MPa minimum tensile strength, and Alleima points it at plate heat exchangers.

Technical details

For scientists and researchers. Everything above comes from the record below: every number with its method, its conditions and its source.

Other names and standards

The same grade under other systems, as datasheets and standards print them. Each code was checked against the page it comes from.

Other names and standards
SystemCodes
UNSR50250
BSTA1
ASTMB265 (strip, sheet and plate), B348 (bars and billets), F67
AMS4921, 4940
ASMESB-265
NameCP Grade 1
Trade nameATI 30, Ti Grade 1

Notes

The method, full conditions and any caveat for the numbered rows above.

Notes for the numbered rows
#MeasurementMethodConditionsCaveat
1Density, barPrinted in the Density row of the ATI 30 product page, which also gives 0.163 lb/in3form bar (the ATI 30 product page prints the same density under each product form)condition not stated—
2Tensile strength, minimum, barPrinted as 35 min (ksi) and 240 min (MPa) on the ATI 30 product pageform bar (ATI 30 product page, Bar block)minimum yes—
3Yield strength, minimum, barPrinted as 20 min (ksi) and 138 min (MPa) on the ATI 30 product pageform bar (ATI 30 product page, Bar block)offset not printed on the product pageminimum yes—
4Elongation, minimum, bar—form bar (ATI 30 product page, Bar block)gauge not printed on the product pageminimum yes—
5Tensile strength, minimum (strip, sheet and plate)Minimum in Table 1 (Tensile Requirements) of the ASTM B265-08b copy, with 35 ksi printed beside 240 MPaform strip, sheet and plate (ASTM B265-08b product)condition as specified for Grade 1 in ASTM B265-08b Table 1minimum yes—
6Yield strength, 0.2 % offset, minimum (strip, sheet and plate)Minimum in Table 1 of the ASTM B265-08b copy, with 20 ksi printed beside 138 MPaform strip, sheet and plate (ASTM B265-08b product)offset 0.2 %minimum yes—
7Yield strength, 0.2 % offset, maximum (strip, sheet and plate)Maximum in Table 1 of the ASTM B265-08b copy, with 45 ksi printed beside 310 MPaform strip, sheet and plate (ASTM B265-08b product)offset 0.2 %maximum yes—
8Elongation, minimum (strip, sheet and plate)Minimum elongation in Table 1 of the ASTM B265-08b copyform strip, sheet and plate (ASTM B265-08b product)gauge 2 in or 50 mmminimum yes—
9Tensile strength, typicalPrinted in the UTS row, typical column, of the Smiths CP Grade 1 datasheetbasis typical, not a minimumform not split by form in the datasheet—
10Yield strength, 0.2 % offset, typicalPrinted as typical yield strength 221 MPa in the Product Description and in the 0.2% PS row of the Smiths datasheetbasis typical, not a minimumoffset 0.2 %form not split by form in the datasheet—
11Elongation on 2 in, typicalPrinted in the Elongation on 2 in row, typical column, of the Smiths CP Grade 1 datasheetbasis typical, not a minimumgauge 2 inform not split by form in the datasheet—
12Reduction of area, minimumPrinted in the Mechanical Properties table of the Smiths CP Grade 1 datasheet. reduction_of_area is not in the canonical list, so a snake_case name is used (see gaps).form not split by form in the datasheetminimum yes—
13Elastic modulus, typicalPrinted in the Mechanical Properties table, Elastic modulus row, Typical column, of the Smiths CP Grade 1 datasheetbasis typical, not a minimumloading not stated in the datasheet—
14Hardness, typicalPrinted as Hardness HV, typical 120, in the Smiths CP Grade 1 datasheet. hardness is not in the canonical list (see gaps).basis typicalform not split by form in the datasheet—
15Beta transus, ATI 30 (CP Grade 1)Printed for ATI 30 in the Physical Properties section of the ATI CP Grade 1 to 4 datasheet (version 1, 2012). The Fahrenheit value 1,630°F is printed alongside. beta_transus is not in the canonical list (see gaps).grade mapping ATI 30 row of the ATI sheet; the ATI 30 product page names ATI 30 as CP Grade 1tolerance ± 4 °C, printed as 888°C ± 4C°—

Corrosion and compatibility

What happens when it meets other materials and environments.

Corrosion and compatibility
EnvironmentConcernWhat happens
Oxidising, neutral and mildly reducing media, including chlorides low Smiths says Grade 1 offers high corrosion resistance in oxidising, neutral and mildly reducing media, including chlorides.1
General corrosion across the ATI commercially pure titanium range low ATI describes the CP titanium range, Grades 1 to 4, as having excellent corrosion resistance. The sheet gives no Grade 1 test data.2
Corrosion details
#EnvironmentDetailsTest conditions
1 Oxidising, neutral and mildly reducing media, including chlorides The Smiths CP Grade 1 datasheet states that the material offers high corrosion resistance in oxidising, neutral and mildly reducing media, including chlorides. The datasheet prints no test conditions, concentrations or temperatures. basis manufacturer statement; no test conditions printed
2 General corrosion across the ATI commercially pure titanium range The ATI technical data sheet covering CP Grades 1 to 4 says those grades are used where high ductility, excellent corrosion resistance, moderate strength and good weldability are desired. This is a general statement for the four grades together, not a Grade 1 test. basis general statement for four grades together; no test conditions

Risks and side effects

Hazards to people, what happens when a cell overheats, and how the material is handled and stored.

For people

The solid metal is not hazard-classed in the sources fetched here. PubChem gives titanium a flammable-solid classification (H228), which applies to powder and swarf.

Solid metal
Sheet, plate, bar and tube are covered by the Smiths and Alleima datasheets, which carry no hazard classification.
Powder and swarf
PubChem gives H228 (flammable solid) from aggregated reports. Treat powder and swarf as a fire hazard.

Test details
The original wording and numbers from the sources, for readers who want them.

Failure risks

Failure risks
FailureTrigger and consequence
Loss of ductility from hydrogen, oxygen, nitrogen or carbon pickupmoderate severityImproper pickling, or forging, heat treating or brazing without protectionATI says the contamination deteriorates ductility, which adversely affects notch sensitivity and forming characteristics.
Limited formability at room temperaturelow severityForming Grade 1 at room temperatureATI says CP titanium has limited formability at room temperature and recommends warm forming for deep drawing and spinning. Smiths says Grade 1 gives optimum ductility and cold formability, so the two sources conflict.

Handling and storage

  • Smiths lists weldability as excellent for Grade 1.
  • ATI says commercially pure titanium is easily welded if precautions prevent oxygen, nitrogen and hydrogen contamination, using inert-gas shielding of the weld metal and the heated zones next to it.
  • ATI says CP titanium can be machined using austenitic stainless steel practice, with slow speeds, heavy feeds, rigid tooling and large amounts of non-chlorinated cutting fluid.

Mitigations

  • Shield welds and heated zones with inert gas, and control pickling and forging so the metal does not pick up hydrogen, oxygen or nitrogen (ATI).

Supply and geography

How common the raw materials are and where they come from.

Titanium sponge (feedstock for titanium mill products)

The USGS 2026 titanium summary read for this profile gives no crustal abundance figure. It refers to a separate titanium mineral concentrates chapter.

Top producers (2025)
China 70.3%, Japan 14.3%, Russia 6.8%, Kazakhstan 4.3%, Saudi Arabia 3.2%

Updated