Dow UCON Quenchant A and A-NN

UCONTM Quenchant A and A-NN (non-nitrite) are nonflammable polymeric quenchants manufactured by The Dow Chemical Company. They are aqueous solutions of a liquid organic polymer and a corrosion inhibitor. The organic polymer is soluble in water and produces a homogenous solution. At temperatures above 74°C (165°F), however, the polymer separates from water as an insoluble phase.

UCON Quenchant A-NN is formulated with a proprietary non-nitrite corrosion inhibitor that is completely compatible with UCON Quenchant A without nitrosamine formation. Analogous quenching performance is obtained with either UCON Quenchant A or A-NN.

When hot metal is quenched in a diluted solution of UCON Quenchant A or A-NN, a film of the liquid organic polymer is deposited on the surface of the hot metal. The rate at which the metal is cooled is governed, in part, by the thickness of the polymer-rich film. The thickness of this film is controlled by the concentration of UCON Quenchant A or A-NN in the quench bath.

The cooling rate is also controlled by adjusting the quench bath temperature and/or the rate of agitation. These parameters, along with product orientation, allow UCON Quenchant A and A-NN to function uniformly in the heat transfer range from water to medium-speed oils.

UCON Quenchant A and A-NN are suitable for:
• The heat treatment of carbon and alloy steels by flames, induction, and submerged induction heating.
• In batch and continuous furnace operations employing gas-fired and carburizing carbonitriding atmospheres.
• With wrought, case and forged aluminum alloys.

• FM Approvals has classified UCON Quenchant A and A-NN as “FM Approved” as tested against the latest testing criteria.

• UCON Quenchant A product meets AMS3025B specifications.
• The optimum operating conditions for a specific metal or part may be determined by control, bath temperature, and/or agitation.
• UCON Quenchant A and A-NN minimize replacement control because of its low deterioration and/or oxidation rate. The major make-up requirement is for water lost by evaporation.
• UCON Quenchant A and A-NN eliminate the smoke, soot and residues common to oil quenchants. Equipment maintenance and plant cleanliness are easier to achieve and maintain.
• UCON Quenchant A and A-NN are soluble in water and resistant to bacterial growth. • UCON Quenchant A and A-NN will freeze below 0°C (32°F). They should be thawed to room temperature and mixed before use. The product will not be affected in any way.

UCONTM Quenchant A 和 A-NN（非亞硝酸鹽）是由陶氏化學公司製造的不可燃聚合物淬火劑。它們是由液態有機聚合物和防腐劑組成的水溶液。這種有機聚合物溶於水並產生均質溶液。然而，在溫度高於74°C（165°F）時，聚合物會從水中分離出來成為不溶相。

UCON Quenchant A-NN 是採用專有的非亞硝酸鹽防腐劑配方製成，完全兼容UCON Quenchant A，不會形成亞硝胺。使用UCON Quenchant A或A-NN都能獲得相似的淬火性能。

當熱金屬浸入UCON Quenchant A或A-NN的稀釋溶液中時，液態有機聚合物會在熱金屬表面形成一層薄膜。金屬的冷卻速率部分取決於這層富含聚合物薄膜的厚度。這層薄膜的厚度可通過控制淬火浴中UCON Quenchant A或A-NN的濃度來調節。

冷卻速率也可以通過調整淬火浴溫度和/或攪拌速率來控制。這些參數，結合產品方向，使UCON Quenchant A和A-NN能夠在從水到中速油的熱傳遞範圍內均勻運作。

UCON Quenchant A和A-NN適用於：

• 通過火焰、感應和浸沒式感應加熱進行碳鋼和合金鋼的熱處理。

• 在採用氣體燃燒和滲碳滲氮氣氛的批次和連續爐操作。

• 適用於鍛造、表面硬化和鍛造鋁合金。

• FM Approvals已根據最新測試標準將UCON Quenchant A和A-NN分類為”FM認證”產品。

• UCON Quenchant A產品符合AMS3025B規格。

• 特定金屬或零件的最佳操作條件可通過控制、浴溫和/或攪拌來確定。

• 由於UCON Quenchant A和A-NN的劣化和/或氧化率低，最大限度地減少了更換控制的需求。主要的補充需求是補充因蒸發損失的水分。

• UCON Quenchant A和A-NN消除了油基淬火劑常見的煙霧、煤煙和殘留物。設備維護和廠房清潔更加容易實現和維持。

• UCON Quenchant A和A-NN可溶於水且能抵抗細菌生長。- UCON Quenchant A和A-NN在0°C（32°F）以下會凍結。應將其解凍至室溫並在使用前混合。產品不會受到任何影響。