Titanium Grade Comparison Chart: ASTM, EN, ISO, DIN, GOST, and GB/T Equivalents Explained

Summary:In global titanium procurement, differences in grade designations across ASTM, GOST, DIN, EN, ISO, and GB/T standards are often the first hurdle. Understanding these relationships helps reduce quotation errors, documentation mismatches, and material acceptance risks in international sourcing. This chart-based guide maps approximate equivalencies for major titanium alloy grades, highlights key distinctions between standards, and offers practical recommendations.

Important Disclaimer:All listed grade correspondence relationships are based on industry practice for materials with similar chemical compositions and mechanical properties, and are provided for technical reference only. "Correspondence" or "approximate correspondence" does not indicate standard equivalence or direct interchangeability. Final acceptance must strictly follow the standards specified in the procurement contract. Material substitution is permitted only after reviewing applicable product standards, customer specifications, and engineering design requirements.

Why Grade Cross-Referencing Is the First Hurdle in Titanium Procurement

A European customer inquires: "We need Grade 5 titanium plate per DIN standard." A Russian customer requests: "Please provide material certificates for ВТ6." A Chinese manufacturer asks: "Which standard should this order comply with?"

Titanium alloys with identical chemical compositions often have completely different names across national standards. "Approximate correspondence" does not mean "equivalent." Understanding these relationships is essential for ensuring smooth material delivery, avoiding rejections, and preventing commercial disputes.

Overview of Major Global Titanium Standards Systems

ASTM (American Society for Testing and Materials):The most widely used system globally. ASTM material grades are defined in product standards such as ASTM B265 (plate), ASTM B348 (bar), ASTM B338 (tube), and ASTM F136 (medical implant bar). Grades follow the "Grade" + number format (e.g., Grade 2, Grade 5). Widely adopted in North America, the Middle East, Southeast Asia, and industrial projects worldwide.

GOST (Russian National Standards):Independent system using Cyrillic letters and numbers (ВТ1-0, ВТ6, ПТ-3В). Widely recognized and frequently required in Russian industrial projects, especially in regulated sectors.

DIN (German) and EN (European Standards):Most current European projects reference EN standards, although DIN material numbers remain common on legacy engineering drawings. EN standards are unified across the EU, with numeric material numbers (e.g., 3.7035 approximately corresponding to Grade 2).

ISO (International):The ISO 5832 series covers surgical implant materials. ISO 5832-3 and ASTM F136 serve as core standards for Ti-6Al-4V ELI. Industrial titanium generally references EN or ASTM.

GB/T (Chinese National Standards):Covers titanium products comprehensively. Chinese exporters are typically familiar with both ASTM and GB/T standards and can provide multi-standard certification.

Approximate Cross-Reference Table for Major Titanium Alloy Grades

This table is for technical communication reference only and should not be considered evidence of formal standards equivalence.

Special Note on ISO 5832-2:This is a medical-grade standard for unalloyed titanium used in surgical implants, not an industrial equivalent to ASTM Grade 2. Medical standards should not be directly substituted with industrial titanium standards.

Note on PT-7M and Grade 9:PT-7M is an alpha-type titanium alloy in the Russian system. Although it serves similar applications in tubing, its chemical composition does not match ASTM Grade 9. If a customer specifies PT-7M,, separate confirmation according to Russian technical conditions is required.

Key Differences Between Standards Systems

Different grade names are just superficial. What truly affects material acceptance:

1. Chemical Composition Ranges:Even within the same alloy system, different standards may specify slightly varying allowable ranges. For applications with tight process windows, these subtle differences can affect process suitability.

2. Mechanical Property Requirements:Different standards have different minimum requirements. The design must be based on the acceptance standard specified, and the two should not be mixed.

3. Test Methods and Acceptance Criteria:ASTM, GOST, and EN standards may differ systematically in tensile test dimensions, test speeds, impact test methods, and NDT acceptance criteria.

4. Heat Treatment Condition:The same grade may have different default heat treatment conditions across standards. Always specify the required condition in your inquiry.

5. Product Form Coverage:Not all standards cover every product form. Verify that the material certificate cites the correct product standard number.

6. Product Certification:Beyond material standards, some applications require additional certifications—such as medical device regulations, aerospace Nadcap accreditation, or classification society approval. Verify these requirements early in the procurement process.

Practical Procurement Recommendations

1. Provide Complete Standards Information:ASTM B265 Grade 5, 2021 edition, annealed, thickness 5 mm

2. Define Primary and Supplementary Standards:If a material must meet two standards, specify the primary one. Requiring "full simultaneous compliance" may necessitate an extremely narrow composition overlap, increasing costs.

3. "Correspondence" ≠ "Equivalence":Written customer approval must always be obtained before substituting materials across standards. Unless the customer provides written acceptance, a supplier must not deliver ASTM Grade 5 as ВТ6, or vice versa.

4. Communicate the Document Language Early:GOST projects typically require Russian-language certificates; EN projects may require EN 10204 3.1 or 3.2 format. Confirm at the inquiry stage.

5. Use Technical Conditions (TU) for Special Grades:For combinations without a formal match, use the customer's technical specification (TU) as the acceptance basis, subject to written agreement prior to contract signing.

Procurement Inquiry Quick Checklist

• ✓ Product Form:Plate / Bar / Tube / Forging / Wire

• ✓ Primary Acceptance Criteria & Product Standard:e.g., ASTM B348, ASTM B265, ASTM B381, EN, GOST, GB/T

• ✓ Grade:Full grade within the relevant system

• ✓ Revision Year:e.g., ASTM B265-21

• ✓ Heat Treatment Condition:Annealed / STA / As-rolled

• ✓ Dimensions & Quantity:Specific dimensions or cut-to-length

• ✓ Material Certificate Type:EN 10204 3.1 / 3.2 / Russian

• ✓ Additional Requirements:NDT, third-party inspection, special packaging

• ✓ Destination Country

Frequently Asked Questions

Q1: Are ASTM Grade 5 and GOST ВТ6 equivalent?
No. Both are Ti-6Al-4V, but GOST specifies its own requirements for composition, properties, and heat treatment. They correspond roughly but are not interchangeable.

Q2: Can a material meet both ASTM and GOST standards?
Yes, subject to composition overlap, testing requirements, and customer approval. Clearly define the primary standard and assess feasibility during the inquiry stage.

Q3: Why do customers still provide DIN grades?
Most current European projects reference EN standards, but DIN designations may still appear in legacy drawings. Confirm the corresponding EN material number for current standard production.

Q4: Can PT-3V be replaced with Ti-6Al-4V??
No. PT-3V is a distinct high-strength Russian alloy. It must be separately confirmed per Russian technical conditions.

Q5: Can you provide material certificates for multiple standards?
Where technically feasible, we can issue multi-standard certificates with cross-references. Please specify your target standards at the inquiry stage.

Q6: What information is needed for a titanium quote?
Provide: standard and revision, grade, product form, dimensions, quantity, heat treatment, certificate type, additional testing requirements, and destination.

Conclusion

Understanding titanium standards and documentation requirements is essential for international procurement. Approximate equivalencies are for technical reference only; final acceptance is always governed by the standard specified in the contract.

We supply titanium plates, bars, tubes, and forgings to ASTM, EN, GOST, and customer specifications. For grade cross-referencing or multi-standard documentation support, please send us your requirements.

[Send us your drawings, standards, material grades, or customer specifications. Our engineering team can assist with grade comparison, documentation review, and quote preparation.]

(Yucheng Hai Titanium | Titanium Plate, Tube, Bar, Forgings |yuchenghaicompany.com)