Stainless Steel OP431 Powder
Overview of Stainless Steel OP431 Powder OP431 stainless steel belongs to the ferritic grade steels which contain chromium as the principal alloying element. The addition of aluminum enhances oxidation and corrosion resistance at high temperatures. Key characteristics of OP431 powder include: Excellent oxidation and corrosion resistance up to 1150¡«C Good creep resistance and thermal fatigue strength Excellent thermo-mechanical stability High thermal conductivity and low thermal expansion Cost-effective compared to austenitic stainless steels Available in various particle size distributions OP431 powder is ideal for applications requiring oxidation resistance, thermal stability and moderate strength at elevated temperatures. Chemical Composition of OP431 Powder OP431 powder has the following nominal composition: Element Weight %…
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Overview of Stainless Steel OP431 Powder
OP431 stainless steel belongs to the ferritic grade steels which contain chromium as the principal alloying element. The addition of aluminum enhances oxidation and corrosion resistance at high temperatures.
Key characteristics of OP431 powder include:
- Excellent oxidation and corrosion resistance up to 1150¡«C
- Good creep resistance and thermal fatigue strength
- Excellent thermo-mechanical stability
- High thermal conductivity and low thermal expansion
- Cost-effective compared to austenitic stainless steels
- さまざまな粒子サイズ分布で利用可能
OP431 powder is ideal for applications requiring oxidation resistance, thermal stability and moderate strength at elevated temperatures.
Chemical Composition of OP431 Powder
OP431 powder has the following nominal composition:
| エレメント | 質量 % |
|---|---|
| 鉄 (Fe) | バランス |
| クロム | 16-18% |
| アルミニウム (Al) | 3-5% |
| Yttrium (Y) | 0.2-0.5% |
| 炭素（C） | 最大0.03% |
| ケイ素（Si） | 1% max |
| マンガン (Mn) | 1% max |
Chromium provides corrosion resistance while aluminum enables excellent oxidation resistance through formation of a protective alumina layer at high temperatures. Yttrium refines the grain size for additional strength.
Properties of OP431 Powder
Key properties of OP431 powder include:
| プロパティ | 価値 |
|---|---|
| 密度 | 7.3 g/cm3 |
| 融点 (Yūten) | 1400-1450¡«Ｃ |
| 熱伝導率 | 29 W/mK |
| 電気抵抗率 | 0.6 Ã×´Î.cm |
| ヤング係数 | 200 GPa |
| ポアソン比 | 0.27-0.30 |
| 引張強度 | 450～650 MPa |
| 降伏強度 | 280-480 MPa |
| 伸長 | 15-20% |
| 抗酸化性 | 1,150度まで耐熱性抜群 |
The properties like high temperature strength, oxidation resistance, and thermal stability make OP431 suitable for demanding applications.
Production Method for OP431 Powder
OP431 powder can be produced via:
- ガスアトマイゼーション高圧不活性ガスで溶融合金を微粒化し、AMに最適な微細球状粉末を得る。
- 水の原子化?- High velocity water jet breaks up the molten stream producing irregular powder particles. Lower cost but higher oxygen pickup.
- 機械合金化?- 合金粉をブレンド後、ボールミル処理を行い、その後焼結、2次アトマイゼーションを実施する方法。
Gas atomization allows excellent control over particle size distribution, morphology, oxygen pickup and microstructure.
Applications of OP431 Powder
Typical applications of OP431 powder include:
- 増材製造?- Selective laser melting to produce complex parts needing high temperature oxidation resistance.
- サーマルスプレーコーティング?- Applied via arc spraying to provide protective coatings on components operating at over 1000¡«C.
- ろう付けフィラー?- For joining ferritic stainless steel parts in high temperature applications.
- 固形燃料着火器?- Powder metallurgy igniter plugs used in industrial furnaces and turbines.
- 溶融金属処理?- Powder metallurgy conveyor rolls, tundishes and ladles used in molten metal handling.
Specifications of OP431 Powder
OP431 powder is available under various size ranges, shapes and grades:
- 粒径:AM手法には15-45µm、サーマルスプレープロセスには最大150µm
- 形態学:球状、不規則形状、混合形状。球状粉末は流動性に優れています。
- 純粋性:用途に応じて、市販グレードから高純度グレードまで。
- 酸素濃度:ほとんどの用途で2000ppm以下を維持。
- 流量：?Powder can be customized for flow rates above 25 s/50 g.
Global Suppliers of OP431 Powder
Some of the major global suppliers of OP431 powder include:
- サンドビックオスプレイ（英国）
- ホーガネス (スウェーデン)
- カーペンター・パウダー・プロダクツ（米国）
- Praxair Surface Technologies (USA)
- CNPC火薬グループ（中国）
These companies produce various grades of OP431 powder tailored for additive manufacturing, thermal spray, powder metallurgy and other high temperature applications.
Pricing of OP431 Powder
OP431 powder is priced higher than austenitic grades but lower than exotic alloys:
- 数量?- $50-100 per kg for bulk orders above 500 kg. Smaller quantities are priced significantly higher.
- 品質高純度の球状パウダーで、特性も制御されているため、プレミアム価格が要求される。
- サプライヤー大手のグローバル・サプライヤーは、大量生産により競争力のある価格を提供している。
- 地理ヨーロッパと北米は高価格市場である。
For critical applications, buyers should focus on quality rather than lowest cost while procuring OP431 powder.
Storage and Handling of OP431 Powder
OP431 powder requires the following storage and handling:
- 酸化を防ぐために不活性ガス下の密閉容器内で保管する必要があります。
- 粉塵爆発のリスクを最小限に抑えるため、微粉の蓄積を避ける。
- Use proper PPE, ventilation, grounding and safety practices during handling
- 粉末と適合しない材料との接触を防ぐ
- Follow safety guidelines provided by supplier SDS
Proper protective measures must be taken when handling this reactive alloy powder.
Inspection and Testing of OP431 Powder
Key quality control tests performed on OP431 powder include:
- OESまたはXRFを使用した化学分析により、組成が規定の限界値内であることを確認します。
- ASTM B822規格に準拠した粒子サイズ分布
- SEMによる形態学的分析
- ASTM B213標準に従って測定された粉体流量
- Oxygen and nitrogen content testing by inert gas fusion
- Density determined by helium pycnometry
- Microstructure characterization by XRD
Thorough testing ensures the powder meets the required chemical, physical and microstructural characteristics for the intended application.
Comparison Between OP431 and 316L Stainless Steel Powders
OP431 and 316L stainless steel powders are compared:
| パラメータ | OP431 | 316L |
|---|---|---|
| タイプ | Ferritic | オーステナイト系 |
| Cr含有量 | 16-18% | 16-18% |
| Ni含有量 | – | 10-14% |
| 高温強度 | 上 | 下げる |
| 耐蝕性 | 中程度 | 素晴らしい |
| 利用料 | 下げる | 上 |
| アプリケーション | Thermal spray, igniters | 自動車、建設 |
| 溶接性 | 貧しい | 素晴らしい |
OP431 offers much better high temperature strength whereas 316L provides excellent fabrication characteristics and corrosion resistance.
OP431 Powder FAQs
Q: How is OP431 powder produced?
A: OP431 powder is commercially produced using gas atomization, water atomization, and mechanical alloying followed by sintering. Gas atomization provides the best control of powder characteristics.
Q: What are the main applications of OP431 powder?
A: Key applications include thermal spray coatings, additive manufacturing, brazing filler, powder metallurgy igniter plugs, and high temperature molten metal handling components where oxidation resistance is needed.
Q: What is the typical OP431 powder size range used in metal AM?
A: For most metal AM processes, the ideal OP431 powder size range is 15-45 microns with spherical morphology and good powder flow characteristics.
Q: Does OP431 powder require any special handling precautions?
A: Yes, it is recommended to handle this reactive powder carefully under inert atmosphere using proper ventilation, grounding, and PPE.
Q: Where can I purchase OP431 powder suitable for thermal spray coatings?
A: For thermal spray applications requiring high temperature oxidation resistance, OP431 powder can be purchased from leading manufacturers including Sandvik Osprey, Hoganas, Praxair Surface Technologies, and CNPC Powder Group.
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