概要 ASTM B348
When it comes to high-performance materials in engineering and industrial applications, ASTM B348 stands out as a standard that governs the specifications for titanium and titanium alloy bars and billets. Whether you’re designing components for aerospace, medical devices, or chemical processing, understanding the intricacies of ASTM B348 is crucial. This article will dive deep into the composition, properties, applications, and specific metal powder models associated with ASTM B348, guiding you through every detail.
Understanding ASTM B348
ASTM B348 is a standard specification developed by ASTM International, which focuses on the requirements for titanium and titanium alloy bars and billets. These materials are known for their high strength, low density, excellent corrosion resistance, and biocompatibility, making them essential in various industries. The specification covers multiple grades of titanium, each tailored to specific applications with varying requirements for mechanical properties, chemical composition, and manufacturing processes.
Composition of ASTM B348 Titanium and Titanium Alloys
The composition of titanium and titanium alloys under ASTM B348 is pivotal in determining their performance characteristics. The table below outlines the typical elements found in different grades covered by ASTM B348.
| グレード | 構成 | 説明 |
|---|---|---|
| グレード1 | Ti (99.5% min), Fe (0.2% max), C (0.1% max), N (0.03% max), O (0.18% max) | Unalloyed titanium, known for its excellent ductility and corrosion resistance. |
| Grade 2 | Ti (99.2% min), Fe (0.3% max), C (0.1% max), N (0.03% max), O (0.25% max) | Slightly stronger than Grade 1, widely used in marine and industrial applications. |
| Grade 3 | Ti (99.1% min), Fe (0.3% max), C (0.1% max), N (0.05% max), O (0.35% max) | Higher strength than Grades 1 and 2, with moderate formability. |
| Grade 4 | Ti (99% min), Fe (0.5% max), C (0.1% max), N (0.05% max), O (0.4% max) | Strongest of the commercially pure titanium grades, excellent for high-stress environments. |
| グレード 5 (Ti-6Al-4V) | Ti（90%）、Al（6%）、V（4%） | Most commonly used titanium alloy, known for its excellent balance of strength, weight, and corrosion resistance. |
| Grade 7 | Ti (99.2% min), Pd (0.12%-0.25%), Fe (0.3% max), C (0.1% max), N (0.03% max), O (0.25% max) | Similar to Grade 2 but with added palladium for enhanced corrosion resistance, especially in reducing acids. |
| Grade 9 | Ti (90%), Al (3%), V (2.5%) | Known for its excellent corrosion resistance and medium strength, often used in aerospace applications. |
| Grade 12 | Ti (98.5%), Mo (0.3%), Ni (0.8%) | Combines good strength with excellent corrosion resistance in both oxidizing and reducing environments. |
| Grade 23 (Ti-6Al-4V ELI) | Ti（90%）、Al（6%）、V（4%） | A lower interstitial variant of Grade 5, offering enhanced fracture toughness and fatigue resistance. |
Key Insights:
- Unalloyed Grades (1-4): These grades are primarily known for their corrosion resistance and ductility. Grades 1 to 4 vary in strength, with Grade 4 being the strongest.
- Alloyed Grades (5, 7, 9, 12, 23): Alloyed grades introduce elements like aluminum, vanadium, palladium, molybdenum, and nickel to improve specific properties such as strength, corrosion resistance, and temperature stability.
Characteristics of ASTM B348 Titanium and Titanium Alloys
Titanium and its alloys exhibit unique characteristics that make them invaluable in demanding applications. Below is a detailed table highlighting the key properties of ASTM B348 materials.
| プロパティ | 説明 | 意義 |
|---|---|---|
| 密度 | Approximately 4.51 g/cm³ | Titanium’s low density contributes to its high strength-to-weight ratio, making it ideal for aerospace and automotive components. |
| 融点 | 1668°C (3034°F) | High melting point ensures stability at elevated temperatures, crucial for high-temperature applications. |
| 耐食性 | Excellent, especially in chloride-containing environments | The formation of a protective oxide layer prevents corrosion, extending the lifespan of components in harsh environments. |
| 生体適合性 | Non-toxic and highly biocompatible | Essential for medical implants and devices, as titanium does not react adversely with body tissues. |
| 熱伝導率 | Relatively low compared to other metals | Helps in applications where thermal insulation is beneficial, but may require considerations in heat dissipation designs. |
| 電気伝導率 | 低い | Not typically used for electrical applications, but its non-magnetic properties are advantageous in certain contexts. |
| 弾性係数 | 100-120 GPa | Provides flexibility in design, especially for components subjected to dynamic loads. |
| 強さ | Varies by grade; Grade 5 (Ti-6Al-4V) can reach up to 1100 MPa | High strength-to-weight ratio makes titanium alloys suitable for high-performance applications. |
| 耐疲労性 | Excellent, particularly in alloyed grades | Critical for components subjected to cyclic loading, such as in aerospace and automotive industries. |
Key Insights:
- 高い強度重量比： Titanium’s combination of strength and lightness is unmatched, making it indispensable in aerospace and sporting equipment.
- Corrosion and Fatigue Resistance: These properties make titanium ideal for harsh environments, including marine and chemical processing industries.
応用例 ASTM B348 材料
ASTM B348 titanium and titanium alloys are utilized across various industries due to their outstanding properties. The following table outlines some of the key applications.
| 産業 | 申し込み | Material Grade |
|---|---|---|
| 航空宇宙 | Aircraft frames, engine components, fasteners | Grades 5, 9, 23 |
| メディカル | Implants, surgical instruments, dental implants | Grades 1, 4, 5, 23 |
| 自動車 | Performance exhausts, suspension components, valves | Grades 5, 9 |
| 化学処理 | Heat exchangers, reaction vessels, piping systems | Grades 2, 7, 12 |
| マリン | Propeller shafts, hulls, marine fasteners | Grades 2, 7, 9 |
| スポーツ用品 | Bicycle frames, golf clubs, tennis rackets | Grades 5, 9 |
| エネルギー | Power plant components, nuclear waste storage | Grades 2, 5, 7 |
| 建築 | Structural components, decorative elements | Grades 2, 5, 9 |
| 石油・ガス | Downhole equipment, offshore drilling components | Grades 5, 9, 12 |
Key Insights:
- Aerospace and Medical Dominance: The aerospace and medical sectors are the largest consumers of titanium alloys, particularly Grades 5 and 23 due to their optimal balance of strength, weight, and biocompatibility.
- Versatility Across Industries: From automotive to sporting goods, the versatility of ASTM B348 materials allows them to meet the specific demands of a wide range of applications.
Specifications, Sizes, Grades, and Standards for ASTM B348
When selecting titanium and titanium alloys under ASTM B348, it’s essential to understand the available specifications, sizes, grades, and standards. This table provides a quick reference.
| 仕様 | 説明 |
|---|---|
| Bar Diameter | Typically ranges from 0.25 inches to 6 inches, customizable for specific applications. |
| Billet Sizes | Available in various sizes depending on the alloy and application requirements, usually up to 14 inches in diameter. |
| グレード | Includes Grades 1, 2, 3, 4, 5, 7, 9, 12, 23 as specified by ASTM B348. |
| 規格 | ASTM B348 covers the chemical and mechanical properties, while additional specifications such as ASTM F67 (for medical devices) or ASTM F136 (for surgical implants) may apply. |
Key Insights:
- Customization Options: The wide range of available sizes and grades allows for tailored solutions to meet specific application needs.
- Compliance with Standards: ASTM B348 compliance ensures materials meet rigorous quality and performance standards required in critical applications.
Specific Metal Powder Models for ASTM B348
When it comes to powder metallurgy, several specific metal powder models are associated with ASTM B348 titanium and titanium alloys. These powders are essential in additive manufacturing (3D printing) and other advanced manufacturing processes. Here are 10 notable models:
- Ti-6Al-4V Grade 5 Powder: The most popular titanium alloy powder, known for its high strength, lightweight, and excellent corrosion resistance, widely used in aerospace and medical applications.
- Ti-6Al-4V ELI (Grade 23) Powder: A variant of Grade 5, this powder offers enhanced fracture toughness and is preferred for medical implants and components subjected to high stress.
- CP Titanium Grade 1 Powder: Pure titanium powder, extremely ductile with excellent corrosion resistance, ideal for chemical processing and marine applications.
- CP Titanium Grade 2 Powder: Offers a good balance of strength and corrosion resistance, commonly used in heat exchangers, marine environments, and architectural structures.
- Ti-3Al-2.5V Grade 9 Powder: Known for its medium strength and excellent formability, this powder is often used in aerospace tubing and sporting goods.
- Ti-0.3Mo-0.8Ni (Grade 12) Powder: This powder combines good strength with outstanding corrosion resistance, particularly in reducing acids, making it suitable for chemical processing.
- Ti-6Al-7Nb Powder: Similar to Ti-6Al-4V but with niobium instead of vanadium, offering biocompatibility and used in medical devices like implants.
- Ti-15Mo Powder: A beta titanium alloy powder that provides high strength and good corrosion resistance, often used in aerospace and medical applications.
- Ti-6Al-2Sn-4Zr-6Mo Powder: This powder is designed for high-temperature applications in aerospace, offering excellent creep resistance.
- Ti-5Al-2.5Sn Powder: Known for its good weldability and medium strength, this powder is often used in aerospace components that require excellent performance at moderate temperatures.
Key Insights:
- Advanced Manufacturing: These powders are vital for producing complex components with high precision, particularly in industries where weight reduction and material performance are critical.
- 多様な用途： From medical implants to aerospace parts, the variety of available powders allows manufacturers to select the optimal material for each specific use case.
Suppliers and Pricing Details for ASTM B348 Materials
Sourcing ASTM B348 materials requires understanding the market landscape, including key suppliers and pricing. Below is a guide to help you navigate these aspects.
| サプライヤー | 所在地 | 利用可能なグレード | 価格（概算） |
|---|---|---|---|
| ATIメタルズ | アメリカ | Grades 1, 2, 5, 7, 9, 23 | $30 – $100 per kg depending on grade and order quantity |
| Timet (Titanium Metals Corporation) | アメリカ、ヨーロッパ | Grades 1, 2, 3, 5, 9, 23 | $35 – $120 per kg, with Grade 5 being on the higher end |
| VSMPO-AVISMA | ロシア | Grades 1, 2, 3, 4, 5, 9 | $25 – $110 per kg, competitive pricing on large orders |
| Toho Titanium | 日本 | Grades 1, 2, 5, 9 | $40 – $130 per kg, depending on market conditions |
| Baoji Titanium Industry Co. Ltd. | 中国 | Grades 1, 2, 3, 5, 7, 9, 23 | $20 – $100 per kg, with lower prices for bulk orders |
| Western Superconducting Technologies | 中国 | Grades 1, 2, 5, 9 | $25 – $110 per kg, pricing influenced by raw material costs |
| Kobe Steel (Kobelco) | 日本 | Grades 1, 2, 3, 5, 9 | $35 – $115 per kg, depending on alloy and demand |
| Hangzhou King Titanium Co., Ltd. | 中国 | Grades 1, 2, 5, 12 | $20 – $95 per kg, lower pricing for common grades |
| Oregon Titanium | アメリカ | Grades 5, 9, 23 | $50 – $150 per kg, specialized in high-performance alloys |
| Tronox Limited | アメリカ | Grades 1, 2, 5 | $30 – $100 per kg, with flexibility on custom orders |
Key Insights:
- Pricing Variability: Pricing for ASTM B348 materials can vary significantly based on the grade, order quantity, and market conditions. Grades with alloying elements like aluminum and vanadium typically command higher prices.
- Supplier Diversity: Multiple suppliers across the globe offer ASTM B348 materials, allowing buyers to choose based on factors like lead time, quality, and pricing.
の長所と短所を比較する ASTM B348 材料
When selecting materials for your project, it’s essential to weigh the pros and cons. Here’s a comparative analysis to help you make an informed decision.
| アスペクト | メリット | デメリット |
|---|---|---|
| 強度重量比 | High strength with low density, ideal for aerospace and automotive applications. | Higher cost compared to other metals like steel or aluminum. |
| 耐食性 | Excellent resistance to a wide range of corrosive environments, including marine and chemical processing. | Susceptible to galling and requires specialized coatings in certain applications. |
| 生体適合性 | Non-toxic and biocompatible, making it suitable for medical implants and devices. | Limited formability in certain grades, requiring precise manufacturing techniques. |
| 熱安定性 | High melting point ensures stability at elevated temperatures. | Low thermal conductivity, which can be a drawback in applications requiring heat dissipation. |
| Availability and Sourcing | Widely available through multiple suppliers, with numerous grades to choose from. | Price fluctuations based on market demand and raw material costs. |
| Manufacturing and Machinability | Can be easily machined and welded in certain grades, especially in powder form. | Requires specialized equipment and processes, which can increase production costs. |
Key Insights:
- Balancing Cost and Performance: While ASTM B348 materials offer superior performance, they come at a higher cost. It’s essential to balance these factors based on your project requirements.
- Specialized Applications: The unique properties of titanium make it indispensable in specialized applications, but these same properties can introduce challenges in manufacturing and processing.
よくあるご質問
| 質問 | 回答 |
|---|---|
| What is ASTM B348? | ASTM B348 is a standard specification for titanium and titanium alloy bars and billets, covering various grades with specific chemical and mechanical properties. |
| Which industries commonly use ASTM B348 materials? | Industries such as aerospace, medical, automotive, chemical processing, marine, and sporting goods frequently use ASTM B348 materials due to their unique properties. |
| What are the main advantages of using titanium alloys? | Titanium alloys offer a high strength-to-weight ratio, excellent corrosion resistance, biocompatibility, and thermal stability, making them ideal for demanding applications. |
| How do the different grades of titanium compare? | Grades 1 to 4 are commercially pure, with varying levels of strength and corrosion resistance. Grades 5, 7, 9, 12, and 23 are alloys with enhanced properties for specific applications. |
| Is titanium difficult to machine? | Titanium can be challenging to machine due to its toughness and tendency to gall, but with the right equipment and techniques, it can be effectively processed. |
| What is the most commonly used titanium alloy? | Ti-6Al-4V (Grade 5) is the most commonly used titanium alloy due to its excellent balance of strength, weight, and corrosion resistance. |
| Can ASTM B348 materials be used in high-temperature applications? | Yes, certain titanium alloys, such as Ti-6Al-2Sn-4Zr-6Mo, are specifically designed for high-temperature applications. |
| Where can I source ASTM B348 titanium materials? | ASTM B348 titanium materials are available from various global suppliers, including ATI Metals, Timet, VSMPO-AVISMA, and Baoji Titanium Industry Co. Ltd. |
| Are there any alternatives to ASTM B348 materials? | Depending on the application, alternatives like aluminum alloys, stainless steel, or nickel-based superalloys may be considered, but they may not offer the same combination of properties as titanium. |
| How do I choose the right grade for my application? | Selecting the right grade depends on factors such as required strength, corrosion resistance, biocompatibility, and operating environment. Consulting with a material specialist or supplier can help in making the right choice. |
結論
ASTM B348 titanium and titanium alloys are some of the most versatile and high-performance materials available in engineering and industrial applications. With their unique combination of strength, corrosion resistance, and biocompatibility, they are indispensable in industries ranging from aerospace to medical devices. Understanding the composition, properties, and applications of these materials, along with the available metal powder models, will help you make informed decisions in your projects. Whether you’re sourcing materials or considering manufacturing techniques, this guide provides the essential knowledge you need to leverage the full potential of ASTM B348.
