1332528 . r-- f?年？月叫修吻正替換頁 ~~ ---」 99年07月22日修正替換頁 .. 九、發明說明： ---- . 【發明所屬之技術領域】 本發明係提供一種麻田散鐵系不銹鋼表面硬度提升之方法，尤指一種 藉由混合氣體中之氫氣將不銹鋼之氧化膜還原，俾使丙烷所提供之碳原子 1 能更容易的進入不銹鋼之基地中，且丙烷(C3H8)之流量控制於〇. 05〜〇. 08 liter/min，俾而達到防止過多之碳原子與鉻形成碳化物，產生敏化現象 進而影響不銹鋼之耐蝕性’本發明藉由上述方法而達成以滲碳方式來提升 • 欲加工件之表面硬度’進而達到一種麻田散鐵系不銹鋼表面硬度提升之方 法者。 【先前技術】 傳統上要於一鋼板上鎖上一顆螺絲，必須先利用鑽尾(Driu)鑽出一個 孔’再利用攻牙器攻出（Tapping)螺牙’然後再鎖上螺絲，因此在使用上 較為不便，後來有人發展出鑽尾螺絲5(SelfDrimngScrew)，而如圖一所 不’係利狀端之網51先在输上進㈣孔，再運用魏牙52之部分， # _頭所鑽之孔進行攻牙，同時直接將該魏螺絲5鎖入，省時又省力而 ^ 廣為使用於建築或木工等行業上； 該鑽尾螺絲5 -般有下列幾種材質：銘合金、合金鋼、不錄鋼…等， 其中，不錄鋼之鑽尾螺絲5常用之材質有沃斯田鐵(Austen^系及麻田散 鐵(Martensite)系，而沃斯田鐵系無法使用熱處理技術來改變其金相組織 結構’所以無法藉域處縣提升硬度，而另—種細散鐵㈣可藉由熱 處理技術來改變其金相組織結構，俾以提升麻田散齡不錄鋼之硬度，因 5 1332528 . 99年07月22日修正替換頁 ，則必須選擇麻田散鐵系 : 此右要使用在鋼構方面，由於鋼鐵之硬度較高 '· 之獨鋼鑽尾螺絲5 ’而在兼顧硬度、祕及雜性的考量下，通常選用1332528 . r-- f? Year? The month is called the kiss and the replacement page is ~~ ---" The replacement page is revised on July 22, 1999. Nine, the invention description: ----. [Technical field of the invention] The present invention provides a Matian iron system A method for improving the hardness of a stainless steel surface, in particular, a method for reducing the oxide film of stainless steel by hydrogen in a mixed gas, so that the carbon atom 1 supplied by propane can more easily enter the base of the stainless steel, and the flow of propane (C3H8) Controlled by 〇. 05~〇. 08 liter/min, to prevent excessive carbon atoms from forming carbides with chromium, causing sensitization and affecting the corrosion resistance of stainless steel. The present invention achieves carburization by the above method. To improve the surface hardness of the workpiece to be processed, and then to achieve a method of improving the hardness of the surface of the granulated stainless steel. [Prior Art] Traditionally, to lock a screw on a steel plate, you must first drill a hole with the Driu and then tap the tapping tool to tap the screw and then lock the screw. It is inconvenient to use, and later someone developed the self-drilling screw 5 (SelfDrimngScrew), and as shown in Figure 1, the net 51 of the end of the profit is first input into the (four) hole, and then the part of the Wei tooth 52, # _ The hole drilled in the head is tapped, and the Wei screw 5 is directly locked in, which saves time and effort and is widely used in construction or woodworking industries; the drill screw 5 generally has the following materials: Alloys, alloy steels, non-recorded steels, etc., among which the non-recorded steel tail screws 5 are commonly used in the material of Austen^ and Martensite, while the Worth Iron is not available. Heat treatment technology to change its metallographic structure] so it is impossible to increase the hardness by using the county, and another kind of fine iron (4) can change its metallographic structure by heat treatment technology, so as to improve the age of the field. Hardness, due to 5 1332528. On July 22, 1999, the replacement page will be revised. Must choose the Ma Tian scattered iron system: This right to use in the steel structure, due to the high hardness of steel '· the single steel self-drilling screw 5 ′, in consideration of hardness, secret and impurities, usually used
AISI 410，其元素成分AISI 410, its elemental composition
…;、麻田散鐵系不銹鋼在進行熱處理技術中之沃斯田鐵化及淬火時， 如與空氣中之氧氣作用即會使得其表面變黑而失去光輝，因此，需要添加 氫氣作為保魏氛，氫氣並會在爐雄氧氣織，阻絕氧氣進人爐内，請 再參閱圖二、三所示’係-般習知常用之方式，其包含： 進料步驟11 ’軸料步职丨储稍嫩人連續爐2内； 一加熱步驟12 ’該加熱步驟12縣進料步驟11所放之補鋼加熱， 且該加齡驟12係由連續爐2之加熱爐21職獨鋼進行加熱，且該加 熱爐21又可區分為一預熱區211及兩沃斯田鐵化區212，且該—預熱區 211及兩沃斯田鐵化區212其溫度係可分別獨立控制及調整；...;, Ma Tian scattered iron stainless steel in the heat treatment technology of Worthing iron and quenching, such as the action of oxygen in the air will make its surface black and lose its brilliance, therefore, the need to add hydrogen as a security Hydrogen will oxidize in the furnace and block the oxygen into the furnace. Please refer to the common methods in the following diagrams in Figures 2 and 3. It includes: Feeding step 11 'Axle material step storage a slightly tender person in the continuous furnace 2; a heating step 12 'the heating step 12 county feeding step 11 put the steel to heat, and the ageing step 12 is heated by the furnace 2 of the continuous furnace 2, The heating furnace 21 can be further divided into a preheating zone 211 and two Worthfield ironification zones 212, and the temperature of the preheating zone 211 and the two Worthfield ironation zones 212 can be independently controlled and adjusted;
一加入分職财驟〗3，肺人分解縫_ 13係當加熱步驟12 之加熱爐21内之溫度達_以上時，即開始將分解氣體加人連續爐2 内，而該分解氣體係藉由下列步生，其包含：—加氨步驟Μ，該加 氨步驟關將氨酿)輸㈣成爐23内；—分解，該分解步 ㈣係將加氨步驟16所提供之氨22由變成爐23將其分解為氮綱及 氫氣⑹；-乾燥步驟18，該乾燥烟8係將分解步驟17其分解氣體之 水氣及未分解之氨22以乾燥器24内之分子篩去除； 一冷卻步驟14 ’料卻轉14係將加熱步 驟12所加熱至沃斯 田鐵 6 99年07月22日修正替換頁 ‘化之補崎由連魏2之冷娜25急it冷卻’且該冷卻爐25後設有向 _ 下傾斜區251 ; 添加氮讀驟19 ’縣加I氣步驟19係將液紐26經由-蒸發 器27蒸發為_，冷卻步驟14巾糊&及向下傾斜區況； 丨料步驟15 ’該出料步驟^係將冷卻步驟14後之不錄鋼送出或 進行其它熱處理，如：回火； 惟’上述習知之光輝熱處理方式其雖可藉由變成爐23分解氨22，俾 •卩產生絲贼氣之分解㈣，再藉由乾聽24内設有分子ff，俾將分 解孔體之水氣及未分解之氨去除’俾祕止這些水氣與未分解的氨^， 在门皿下與不錄鋼接觸，而導致不錄鋼無法光輝，另該分解氣體係於加熱 爐21其,皿度於5〇(rc以上後再送入，俾使分解氣體中之氫氣自燃，且隨 者分解氧體逐漸填滿加熱爐2卜俾使火焰逐漸往加熱爐21之進料處方向 移動最後於連續爐2之進料口處產生火簾，俾以阻絕外部氧氣進入連續 爐2内’俾而達光輝效果，又冷卻爐25及向下傾斜區251皆灌入氮氣， 擊且出口處採向下傾斜，俾而更進-步阻絕氧氣進入； 然’她處理後之麻田散鐵系不細，其表面硬度通常為49〇~圖 Hv〜部硬度為.430 ’因此’該不錢鋼鑽尾螺絲5在對3咖之MSI3〇4 鑽孔時1¾鑽尾螺絲5係因表面硬度不足而無法成功地鑽孔施工； 再如，中華民國專利公報公告號第2〇5〇72號「奥斯田鐵系不錄鋼與 低碳鋼或低碳合金鋼形成的複合自攻與自鑽螺絲之製法」，其主要係將母 材為低碳鋼或低碳合金鋼，並預先鍛造或切削成含肩部及無螺紋柄部或含 7 卯年07月22日修正替換頁 鑽尾部之’，在轉碳及適#減理後，與預^成形卿 鐵系不錄鋼圓桿以焊接方法接合在一起，隨後切削焊接毛邊與渗碳鋼圓 知之肩部’已形成一適當寬度之無滲碳硬化區’最後進行滾螺紋加工及全 4火處理’以製成—麵部與具螺紋柄締結部為奥斯田鐵系不錄鋼材質， 文螺紋。卩與鑽尾部為低碳鋼或低碳合金鋼材質之自攻與自鑽螺絲； 准，上述之「奥斯田鐵系不銹鋼與低碳鋼或低碳合金鋼形成的複合自 攻與自鑽螺絲之製法」其雖可以焊接方式將材質為低碳鋼或低碳合金鋼之 自攻螺紋與舰部及材質為奥斯_系之聊及具敎之柄部接合在_ 起’俾而可鑽較厚之鋼板； 然’該頭部與具螺紋柄締結部為奥斯田鐵系不銹鋼材質，而自攻螺紋 4與鑽尾部為低碳鋼或低碳合金蹄冑之自攻與自網絲，補程步驟上 太過璃碎，往往因此提㊉製造成本且降低生產率，再者，製程步驟越是項 碎相對的於餘上錯地齡也會提升，俾使不良品產生之機率也相對提 尚，又該螺絲在材質為彳&碳鋼或低碳合金鋼之部分係非不銹鋼，因此，該 低碳鋼或低碳合金鋼部份其耐蝕性較差，俾而降低螺絲之使用壽命； 是故，如何在不影響麻田散鐵系不銹鋼其韌性及耐蝕性下，控制滲碳 的流量，俾以最大幅度地提升麻田散鐵系不銹鋼其表面硬度之方法者，即 為本案發明人所欲解決之技術困難點之所在。 【發明内容】 本發明係提供一種麻田散鐵系不錄鋼表面硬度提升之方法，其主要係 於乾燥步驟後加入一氣體混合步驟及一加入丙烷步驟，其中： 一加入丙烷步驟，該加入丙烷步驟係將丙烷加入氣體混合器内，且 99年07月22日修正替換頁 該丙烷之流量係由一微流量計控制於0·05〜〇 〇8 Hter/min ; -氣體混合步驟’該氣體混合步驟係將該乾燥步驟後之氣體與丙燒 由一氣體混合器混合後一起送入加熱爐内； 俾藉由混合氣體巾之統將不細之氧⑽魏，俾使丙院所提供 之碳原子更容易的進入不錄鋼之基地令，且丙烧之流量控制ς 〇· 05〜0. 08 liter/rain，俾而達到防止過多之碳原子與鉻形成碳化物，產 生敏化現象進而影響不錄鋼之耐錄，本發明藉由上述方法而達成以渗 碳方式來提升欲加工件之表面硬度，進而達到一種麻田散鐵系不錄鋼表 面硬度提升之方法者。 【實施方式】 、為使4查貞:¾•㈣麟解本發明之其鱗_容錢點及其所 達成之功效能夠更為顯現，雜本發明配合關，詳細說明如下： 本毛月主要係於乾燥步驟後加人—氣體混合步锁及—加入丙烧步 驟’請參閱圖四、五所示，係本發明之實施步驟，其包含有： 一進料轉3卜該補轉31係將獨峨人_爐4内； 加熱步帮32 ’该加熱步驟32係將進料步驟31所放之不錄鋼加熱， 且該加,，，、步驟32係藉由連續爐4之加鋪41對該稍鋼進行加熱，且該 力。’’’、爐41又可區分為一預熱區411及兩沃斯田鐵化區仍，且該一預熱 品及兩沃斯田鐵化區412其溫度係可分別獨立控制及調整，又該預熱 區411 :度叹為92〇c〜1〇〇〇c ’而該兩沃斯田鐵化區仙溫度設為腦 C〜1〇8〇°C ’且不鎮鋼之沃斯田鐵化時間為30分鐘； 加混。氣趙步帮33 ’該加入混合氣體步驟33係當加熱步驟32之 度達5()()c以上時’即開始將混合氣體加人連續爐4内， 而該混°讀係藉細下列步驟產生，其包含： 1332528 99年07月22日修正替換頁 一加氨步驟36,該加氨步驟36係將氨42(NH3)輸出至變成爐43内； 一分解步驟37，該分解步驟37係將加氨步驟36所提供之氨42由 變成爐43將其分解為氮氣(N2)及氫氣(¾)，且該變成爐43之溫度設為 920〇C~980〇C ； 一乾燥步驟38 ’該乾燥步驟38係將分解步驟37其分解氣體之水 氣及未分解的氨42以乾燥器44内之分子篩去除，而經該乾燥器44去 除水氣後之分解氣體其露點為-50°C以下，又該乾燥器44後設有流量計 441，且該流量計441係將分解氣體之流量設為5〜6 m3/min ; 一加入丙烧步驟310，該加入丙烷步驟31〇係將丙烷46加入氣體混 合器47内，且該丙烷46後設有一微流量計461，且該微流量計461係 將丙烧46其流量設為〇. 〇5~〇. 〇8 liter/min ; 一氣體混合步驟39，該氣體混合步驟39係將該乾燥步驟38後之 分解氣體與加人秘步驟310中之眺46由-氣體混合器47混合後-起送入連續爐4内； -冷卻步腿’該冷卻步職翁加齡驟32所加熱至沃斯田鐵化 之不錄鋼藉由_爐4之冷卻爐45急私卻，且該冷碰&後設有向下 傾斜區仙，該冷卻爐45係浸人水射，且該水箱之水溫射跑外之 冷卻水塔維持在室溫溫度； -添加氣氣步琢311 ’該添加氮氣步驟311係將液態氮48經由一蒸發 器49細氣祕’送至冷卻麵34巾之冷輸5及向下傾斜區抓 出料烟5 ’該出料步驟35係將冷卻步驟％後之不錄鋼送出或進 打其匕熱處理，如：回火； 1 本ΓιΓΛΓ編咖綱Gt~98Gt來分概42,俾以產生 風氣”氮，再鶴_ 44 __，俾將分解氣體 1332528 . __ 99年07月22日修正替換頁 ' 之水氣及未分解之氨去除，俾而使得分解氣體之露點為-5〇t：以下，俾可 - 防止這些水氣與未分解的氨42，再高溫下與不銹鋼接觸，而導致不銹鋼 無法光輝，另又藉由一氣體混合步驟39將該分解氣體與加入丙烷步驟31〇 中之丙烷46以一氣體混合器47混合在一起後，且於加熱步驟32中加熱 • 爐41溫度達500°C後’再將該混合氣體送入爐内，俾使混合氣體中之氫 氣自燃，且隨著分解氣體逐漸填滿加熱爐41，俾使火焰逐漸往加熱爐41 之進料處方向移動，最後於連續爐4之進料口處產生火簾，俾以阻絕外部 氧氣進入連續爐4内’俾而達光輝效果，且又更進一步的利用混合氣體中 • 之氫氣將不銹鋼之氧化膜還原，俾使本發明所加之丙烷46所提供之碳原 子更谷易的進入不銹鋼之基地中縮短滲碳時間，且丙烷46之流量控制於 0. 05〜0. 08 liter/min，俾而達到防止過多之碳原子與鉻形成碳化物，產 生敏化現象進而影響不銹鋼之耐蝕性，因此，本發明除具有習知光輝功效 外’更進-步地藉由上述方法來達成渗微果，俾以提升麻田賴系不銹 鋼之表面硬度，進而達到一種麻田散鐵系不錄鋼表面硬度提升之方法者； 凊再參閱下細示，係雜本個處理步碰之舰縣與習知處理 步驟後之鑽尾螺絲’對3刪厚之AISI304鋼板作鑽孔與对錄測試之結果: 條件 預熱區 溫度 沃斯田 鐵化區 (-) 沃斯田 鐵化區 (二） 加入丙 烧流量 (1/min) 不錄鋼 表面硬 度 不銹鋼 心部硬 度 可鑽孔 數 浸純水 24小時 習知 (一） 1000°c 1040°c 1040°C 490-500 410-430 0 無銹點 習知 (二） 1000°c 1080°c 1080°C 無 530-560 420-450 1 無銹點 本發明 1000°C 1040°C 1040°C 0.07 700-760 400-430 3-4 無銹點 由上表可知’藉由本發明之處理方式，俾可大幅提升不賴之表面硬 度’而心部硬度變化不大保留有動性，且浸於純水24小時亦無錄點產生， 因此’經本發明處理步驟後之不銹鋼可同時兼顧硬度、勒性及耐餘性，俾 使本發明之鑽尾螺絲對3mm厚之AISI3G4鋼板作鑽孔可達3〜4孔，大幅提 1332528 . 99年07月22日修正替換頁 ' 升細散齡獨鋼鐵綱絲地實用性； • 綜上所述，本發明在突破先前之技術結構下，確實已達到所欲增進之 功效’且也賴辆項技藝者所狄思及，再者，本發明申請前未曾公開， 其所具之進步性、實用性，顯已符合發明專利之申請要件，襄依法提出申 請’懇請貴局核准本件發明專利申請案，以勵創作，至感德便。 【圖式簡單說明】 第一圖係為鑽尾螺絲示意圖。 ® 第二圖係為習知之步驟流程方塊圖。 第三圖係為習知之處理流程示意圖。 第四圖係為本發明之步驟流程方塊圖。 第五圖係為本發明之處理流程示意圖。 【主要元件符號說明】 ll···進料步驟 13···力σ入分解氣體步驟 15…出料步驟 17…分解步驟 19…添加氮氣步驟 2…連續爐 211…預熱區 22…氨 12···加熱步驟 14···冷卻步驟 16...加氨步驟 18···乾燥步驟 21···加熱爐 212···沃斯田鐵化區 Μ…變成爐 12 1332528As soon as the temperature in the heating furnace 21 of the heating step 12 reaches _ or more, the decomposition gas is added to the continuous furnace 2, and the decomposition gas system is borrowed. By the following steps, which comprise: - an ammonia addition step, the ammonia addition step is to turn the ammonia into a furnace 23; - the decomposition, the decomposition step (4) is to change the ammonia 22 provided by the ammonia addition step 16 The furnace 23 decomposes it into nitrogen and hydrogen (6); - a drying step 8 which removes the water of the decomposition gas and the undecomposed ammonia 22 of the decomposition step 17 by molecular sieves in the dryer 24; 14 'Materials turn 14 series will heat step 12 to heat to Worthite iron 6 99 July 22 revised replacement page 'Chemical Fujisaki from Lian Wei 2's cold Na 25 urgent it cooling' and the cooling furnace 25 The slanting region 251 is provided with a downward slanting zone; the nitrogen reading step 19 is added to the county, and the gas step 26 is used to evaporate the liquid button 26 to the _ via the evaporator 27, and the cooling step 14 is smeared & Dipping step 15 'the discharging step ^ is to send out the non-recorded steel after the cooling step 14 or perform other heat treatment, such as: tempering; 'The above-mentioned radiance heat treatment method can decompose ammonia 22 by turning into furnace 23, and 分解 卩 卩 卩 卩 ( ( ( ( ( ( 四 四 四 四 四 四 四 四 四 四 四 四 四 设有 设有 设有 设有 设有 设有 设有 设有 设有 设有 设有 设有 设有 设有 设有 设有And undecomposed ammonia removal '俾 secrets these water vapors and undecomposed ammonia ^, in contact with the non-recorded steel under the door, which leads to the failure to record steel, and the decomposition gas system in the heating furnace 21, the dish The degree is 5 〇 (the rc or more is fed again, so that the hydrogen in the decomposition gas is self-ignited, and the decomposed oxygen body gradually fills the heating furnace 2, so that the flame gradually moves toward the feeding direction of the heating furnace 21, and finally continues A fire curtain is generated at the inlet of the furnace 2, so as to block the external oxygen from entering the continuous furnace 2, and the brilliance effect is achieved, and the cooling furnace 25 and the downward inclined region 251 are filled with nitrogen gas, and the outlet is taken downward. Tilting, squatting and getting further - step to block oxygen from entering; However, after her treatment, the granulated iron is not fine, its surface hardness is usually 49 〇 ~ Figure Hv ~ part hardness is .430 'so 'the money steel tail When the screw 5 is drilled into the MSI3〇4 of the 3 coffee, the 13⁄4 self-drilling screw 5 is due to insufficient surface hardness. The method successfully drilled the hole; for example, the Republic of China Patent Gazette No. 2〇5〇72 "Austenian iron system does not record steel and low carbon steel or low carbon alloy steel composite self-tapping and self-drilling screws The method of production, which mainly uses the base metal as low carbon steel or low carbon alloy steel, and is pre-forged or cut into a shoulder-containing and unthreaded shank or a modified replacement page drill tail on July 22, 2007. After the transfer of carbon and suitable for the reduction, the pre-formed steel is not welded to the steel rod by welding, and then the welded burr and the carburized steel are known to have a proper width. The carburizing hardened zone 'finished the rolling thread processing and all four fire treatments' to make - the face and the threaded shank to the knot is the Osda iron non-recorded steel material, thread. Self-tapping and self-drilling screws made of low carbon steel or low carbon alloy steel at the end of the boring and drilling; Standard, self-drilling and self-drilling of the above-mentioned "Austin iron stainless steel and low carbon steel or low carbon alloy steel The method of making the screw can be welded to the self-tapping thread of the low carbon steel or low carbon alloy steel and the ship and the material for the Oss and the stalks of the shackle. Drill a thicker steel plate; however, the head and the threaded shank are made of Austin iron stainless steel, while the self-tapping thread 4 and the tail of the drill are low carbon steel or low carbon alloy hoof. Silk, the step of the repair process is too smashed, often resulting in 10 manufacturing costs and reduced productivity. Moreover, the more the process steps are, the more the wrong age will be, and the chances of producing defective products will also increase. Relatively mentioning, the screw is made of non-stainless steel in the part of carbon steel or low carbon alloy steel. Therefore, the low carbon steel or low carbon alloy steel part has poor corrosion resistance, which reduces the use of screws. Life; why, how to not affect the toughness of the Ma Tian scattered iron stainless steel Under the corrosion resistance, the method of controlling the flow rate of carburizing and maximizing the surface hardness of the Matian iron-based stainless steel is the technical difficulty point that the inventor of the present invention is trying to solve. SUMMARY OF THE INVENTION The present invention provides a method for improving the surface hardness of a granulated iron-based unrecorded steel, which is mainly a step of adding a gas mixing step and a step of adding a propane after the drying step, wherein: a propane step is added, the propane is added. The step is to add propane to the gas mixer, and the flow rate of the propane is controlled by a micro flow meter from 0.05 to 〇〇8 Hter/min on the July 22, 1999; - gas mixing step 'the gas The mixing step is that the gas after the drying step is mixed with the propylene gas by a gas mixer, and then sent to the heating furnace; 俾 the oxygen gas (10) Wei, which is supplied by the hospital, is supplied by the mixed gas towel. It is easier for carbon atoms to enter the base of non-recorded steel, and the flow control of propylene is ς 〇· 05~0. 08 liter/rain, to prevent excessive carbon atoms from forming carbides with chromium, causing sensitization In the invention, the surface hardness of the workpiece to be machined by the carburizing method is achieved by the above method, thereby achieving a method for improving the hardness of the surface of the granulated iron. [Embodiment] In order to make 4 check: 3⁄4•(4) Lin Jie, the scale of the invention and the effect achieved by the invention can be more apparent, and the invention is combined with the details, as follows: After the drying step, a human-gas mixing step lock and a step of adding a propylene burning step are shown in FIGS. 4 and 5, which are the implementation steps of the present invention, which include: a feeding turn 3 b. In the furnace 4, the heating step 32', the heating step 32 is to heat the unrecorded steel placed in the feeding step 31, and the addition, the, and the step 32 are performed by the continuous furnace 4 41 The steel is heated and the force is applied. ''', the furnace 41 can be further divided into a preheating zone 411 and two Worthfield ironation zones, and the temperature of the preheating product and the two Worthfield Tiehua District 412 can be independently controlled and adjusted. In addition, the preheating zone 411: the degree of sigh is 92〇c~1〇〇〇c ' and the temperatures of the two Worthite ironification zones are set to brain C~1〇8〇°C' and the steel of the town is not Tian Tiehua time is 30 minutes; add up. The gas step 33' is added to the mixed gas step 33. When the degree of the heating step 32 reaches 5 () () c or more, the mixed gas is added to the continuous furnace 4, and the mixed reading is produced by the following steps: , which comprises: 1332528, July 22, 1999, a replacement page, an ammonia addition step 36, the ammonia addition step 36 is to output ammonia 42 (NH3) into the furnace 43; a decomposition step 37, the decomposition step 37 will The ammonia 42 supplied from the ammonia addition step 36 is decomposed into nitrogen (N2) and hydrogen (3⁄4) by the furnace 43, and the temperature of the furnace 43 is set to 920 〇C to 980 〇C; a drying step 38' The drying step 38 removes the water gas and the undecomposed ammonia 42 of the decomposition gas in the decomposition step 37 by the molecular sieve in the dryer 44, and the decomposed gas after removing the moisture through the dryer 44 has a dew point of -50 ° C or less. Further, the dryer 44 is provided with a flow meter 441, and the flow meter 441 sets the flow rate of the decomposition gas to 5 to 6 m3/min; and the addition of the propane step 310, the addition of the propane step 31 is the propane 46. Adding to the gas mixer 47, and the propane 46 is provided with a micro flow meter 461, and the micro flow meter 461 is C 46, the flow rate is set to 〇. 〇5~〇. 〇8 liter/min; a gas mixing step 39, the gas mixing step 39 is the decomposition gas after the drying step 38 and the enthalpy 46 in the adding step 310 - the gas mixer 47 is mixed and fed into the continuous furnace 4; - the cooling step leg 'the cooling step is heated by the ageing step 32 to the unloaded steel of the Worthfield iron by the furnace 4 Privately, and the cold touch & is provided with a downward sloping area, the cooling furnace 45 is immersed in water, and the cooling tower outside the water temperature of the water tank is maintained at room temperature; - adding gas Step 311 'The nitrogen addition step 311 sends the liquid nitrogen 48 to the cooling surface 34 via the evaporator 49 and sends it to the cooling surface 34 and the downward inclined area to pick up the smoke 5'. After the cooling step %, the unrecorded steel is sent out or subjected to heat treatment, such as: tempering; 1 Γ ΓΛΓ ΓΛΓ ΓΛΓ ΓΛΓ G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G The decomposed gas 1332528 . __ July 22, 1999 revised replacement page 'the water and undecomposed ammonia is removed, so that the dew point of the decomposition gas is -5 t: The following, 俾-- prevent these moisture and undecomposed ammonia 42, and then contact stainless steel at high temperature, resulting in the stainless steel not shining, and the gas is mixed with propane by a gas mixing step 39. After the propane 46 is mixed together by a gas mixer 47, and heated in the heating step 32, the temperature of the furnace 41 reaches 500 ° C, and then the mixed gas is sent into the furnace to ignite the hydrogen in the mixed gas. And as the decomposition gas gradually fills the heating furnace 41, the flame is gradually moved toward the feeding direction of the heating furnace 41, and finally a fire curtain is generated at the inlet of the continuous furnace 4 to block external oxygen from entering the continuous furnace. In the 4th, the brilliance effect is achieved, and further, the hydrogen oxide film of the mixed gas is used to reduce the oxide film of the stainless steel, so that the carbon atom provided by the propane 46 of the present invention can be more easily entered into the base of the stainless steel. Shortening the carburizing time, and the flow rate of propane 46 is controlled at 0. 05~0. 08 liter/min, which prevents the formation of carbides from excessive carbon atoms and chromium, which causes sensitization and thus affects the corrosion resistance of stainless steel. Therefore, in addition to the conventional brilliance effect, the present invention further achieves the infiltration of the micro-fruit by the above method, thereby improving the surface hardness of the diarrhea stainless steel, thereby achieving a granulated iron system. The method of improving the surface hardness; 凊 Refer to the following detailed description, which is the drilling and boring test of the AISI304 steel plate of the 3th thickened AISI304 steel plate. Result: Condition preheating zone temperature Vostian Tiehua District (-) Vostian Tiehua District (2) Adding C-burning flow rate (1/min) No steel surface hardness Stainless steel core hardness Drilling number Dip pure water 24-hour knowledge (1) 1000°c 1040°c 1040°C 490-500 410-430 0 No rust point (2) 1000°c 1080°c 1080°C No 530-560 420-450 1 No rust The present invention 1000 ° C 1040 ° C 1040 ° C 0.07 700-760 400-430 3-4 rust-free points from the above table can be seen 'by the treatment of the present invention, 俾 can greatly improve the surface hardness ' and the hardness of the heart The change is not much retained, and it is immersed in pure water for 24 hours without recording. Therefore, the invention is After the treatment step, the stainless steel can simultaneously take into account the hardness, the character and the residual capacity, so that the drilling screw of the present invention can drill 3~4 holes in the 3mm thick AISI3G4 steel plate, and greatly increase the 1332528. July 22, 1999 The revised date of the replacement page is as follows: • In summary, the invention has indeed achieved the desired effect under the previous technical structure, and it is also dependent on the craftsman. Di Sihe, and further, the invention has not been disclosed before the application, and its progressiveness and practicability have been consistent with the application requirements of the invention patent, and the application is filed according to law, and you are requested to approve the application for the invention patent. Creation, to the sense of virtue. [Simple description of the diagram] The first diagram is a schematic diagram of the drill tail screw. ® The second diagram is a block diagram of the process steps of the prior art. The third figure is a schematic diagram of a conventional process flow. The fourth figure is a block diagram of the steps of the present invention. The fifth figure is a schematic diagram of the processing flow of the present invention. [Description of main component symbols] ll···feeding step 13··· force σ into decomposition gas step 15... discharging step 17... decomposition step 19...adding nitrogen step 2...continuous furnace 211...preheating zone 22...ammonia 12 ··· Heating step 14···Cooling step 16...Ammonia step 18···Drying step 21···Heating furnace 212···Worthfield Tiehua District Μ...turning into furnace 12 1332528
99年07月22日修正替換頁 24…乾燥器 25···冷卻爐 251···向下傾斜區 26…液態氮 27…蒸發器 31…進料步驟 32…加熱步驟 33…加入混合氣體步驟 34…冷卻步驟 35…出料步驟 36…加氨步驟 37…分解步驟 38…乾燥步驟 39…氣體混合步驟 310…加入丙炫步驟 311···添加氮氣步驟 4…連續爐 41…加熱爐 411···預熱區 412…沃斯田鐵化區 42…氨 43…變成爐 44…乾燥器 441…流量計 45…冷卻爐 451…向下傾斜區 46…丙烧 461…微流量計 47…氣體混合器 48…液態氣 49…蒸發器 5…鑕尾螺絲 51…鑽頭 52…螺牙 13Correction Replacement Page 24 on July 22, 1999... Dryer 25···Cooling Furnace 251··· Downward Tilting Zone 26...Liquid Nitrogen 27...Evaporator 31...Feeding Step 32...Heating Step 33...Adding Mixing Gas Step 34...cooling step 35...feeding step 36...addition of ammonia step 37...decomposition step 38...drying step 39...gas mixing step 310...addition of condensing step 311···adding nitrogen step 4...continuous furnace 41...heating furnace 411· · Preheating zone 412...Worthfield ferrochemical zone 42...Ammonia 43...melting furnace 44...dryer 441...flow meter 45...cooling furnace 451...downward inclined zone 46...acrylic 461...micro flowmeter 47...gas Mixer 48...liquid gas 49...evaporator 5...saw screw 51...drill 52...thread 13