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首頁 >> 產品中心 >> 鈦合金材料 >> 鈦棒
  • 化工用TC4鈦合金棒
  • 化工用TC4鈦合金棒
  • 化工用TC4鈦合金棒
  • 化工用TC4鈦合金棒

化工用TC4鈦合金棒

材質:Ti-6Al-4V

執行標準: ASTM B348、ASTM F1472、ISO 5832-3、GB/T 2965-2020、GB/T 3620.1、NB/T 47010

瀏覽次數:

發布日期: 2024-11-22 09:59:25

全國熱線: 0917-3376170

詳細描述 / Detailed description

1、化工用TC4鈦合金棒

TC4鈦合金棒(對應國際牌號Ti-6Al-4V,國內牌號TC4)是一種以鈦為基體,添加6%鋁(Al)和4%釩(V)的α+β雙相鈦合金棒材,專為化工設備中耐腐蝕、耐高溫、高強度的需求設計,廣泛用于制造泵閥、反應器、管道等關鍵部件。

2、材質

化學成分(質量分數,%)

Ti:基體(≥89%)

Al:5.5-6.75%

V:3.5-4.5%

Fe:≤0.30%

O:≤0.20%

C:≤0.08%

N:≤0.05%

微觀結構:α相(密排六方)與β相(體心立方)共存,通過熱處理可調控兩相比例,優化性能。

3、性能要求

1)耐腐蝕性:

在氧化性介質(如硝酸、濃硫酸)中耐蝕性優異,但在還原性酸(如鹽酸、稀硫酸)中需配合緩蝕劑或表面涂層使用。

抗氯離子應力腐蝕開裂(SCC)能力優于不銹鋼。

2)力學性能:

抗拉強度:≥895 MPa(退火態)

屈服強度:≥828 MPa

延伸率:≥10%(標距50 mm)

彈性模量:約110 GPa

3)高溫性能:

長期使用溫度:≤400℃(短期可達600℃)

高溫下仍保持較高強度,抗氧化性優于普通鋼。

4)加工性能:

熱加工性良好(鍛造溫度900-950℃),冷加工需中間退火(700-750℃)避免開裂。

4、制造工藝

1)熔煉:

真空自耗電弧熔煉(VAR):確保成分均勻,減少雜質(O、N、H)。

電子束冷床熔煉(EBCHM):進一步降低夾雜物,提升純度。

2、)鍛造與軋制:

開坯鍛造:將鑄錠鍛造成棒坯,細化晶粒。

熱軋/冷軋:控制棒材直徑(常見規格Φ20-200 mm),優化表面光潔度。

3)熱處理:

退火:750-800℃保溫1-2小時,空冷,消除內應力,提高塑性。

固溶+時效:920℃固溶后水淬,500-600℃時效,提升強度(可達1100 MPa)。

4)表面處理:

酸洗(HF+HNO?混合液)去除氧化皮。

噴砂或拋光(Ra≤1.6 μm)減少介質附著。

陽極氧化或鍍鈀(Pd)增強局部耐蝕性。

5、執行標準

1)國際標準:

ASTM B348:鈦及鈦合金棒材和坯料標準(涵蓋TC4)。

ASTM F1472:外科植入用Ti-6Al-4V合金標準(高純度要求)。

ISO 5832-3:外科植入物用Ti-6Al-4V合金。

2)中國標準:

GB/T 2965-2020:鈦及鈦合金棒材(對應TC4)。

GB/T 3620.1:鈦及鈦合金牌號和化學成分。

NB/T 47010:承壓設備用鈦及鈦合金鍛件技術條件。

6、具體應用

1)反應器與塔器:

氯堿工業中電解槽電極支架、氯氣干燥塔內構件。

2)泵閥與管道:

輸送強腐蝕介質(如發煙硝酸、有機氯化物)的離心泵葉輪、閥門閥桿。

3)熱交換器:

海水淡化、酸性氣體冷卻的管束與殼體(需防點蝕設計)。

4)電化學設備:

濕法冶金中的陽極板、電解槽導電棒。

5)環保設備:

煙氣脫硫(FGD)系統的噴淋管、攪拌軸。

7、選購注意事項

1)材料認證:

要求供應商提供材質證明(MTC)及第三方檢測報告(如SGS),確保符合ASTM B348或GB/T 2965。

2)耐腐蝕適配性:

根據介質類型(pH、Cl?濃度、溫度)選擇表面處理工藝(如鍍鈀用于含Cl?環境)。

3)加工狀態選擇:

退火態(O)適用于后續冷加工(如彎管),固溶時效態(STA)用于直接承力部件。

4)供應商資質:

優先選擇具備軍工或核電供貨經驗的廠商,確保工藝穩定性。

5)成本控制:

TC4棒材價格約300-500元/kg,若僅需耐蝕性,可考慮純鈦(CP-Ti,價格低30%)。

6)檢測手段:

超聲波探傷(UT)檢測內部缺陷,金相分析驗證晶粒度(應≤5級)。

TC4鈦合金棒在化工領域憑借其高強度、耐腐蝕和高溫穩定性,成為苛刻工況下的理想材料。然而,其高成本和對還原性酸敏感的特性需通過合理選材與表面改性技術(如涂層、合金化)彌補。未來,隨著鈦合金粉末冶金(PM)和增材制造(3D打印)技術的發展,復雜結構鈦部件的定制化生產將進一步提升其在化工裝備中的應用潛力。選購時需嚴格把控供應商資質與材料性能數據,確保符合工況需求與安全規范。

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