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上海斯米克D812鈷基2號堆焊焊條ECoCr-B鈷基焊條

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山東焊橋焊材有限公司

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上海斯米克電焊條】簡介

Category 類別	Trade- Mark 牌號	Equivalent to China Standard 相當國標	Characteristics & application 特性和用途	Equivalent to AWS 相當AWS
Hard-surfacing 硬面堆焊	D 667	EDZCr-B-15	HRc≥48. Resistance to wear, gas corrosion and oxidation. Hardfacing of blast furnace hopper and cracker part. HRc≥48，耐磨、耐氣蝕、抗氧化。堆焊高爐料鐘、破碎機件
	D 802	EDCoCr-A-03	HRc38-47. Resistance to heat, wear and corrosion. Hardfacing of high temperature part such as the edge of thermo-cutter. HRc38-47，耐熱、耐蝕、耐磨。堆焊高溫工件如熱剪切刀刃	ECoCr-A
	D 812	EDCoCr-B-03	HRc45-50. Resistance to heat, wear and corrosion. Hardfacing of high temperature part such as internal-combustion engine valve. HRc45-50，耐熱、耐蝕、耐磨。堆焊高溫工件如內燃機閥	ECoCr-B
	D 822		HRc≥53. Resistance to Wear and heat, bad shock resistance. Hardfacing of rotating blade wheel of boiler. HRc≥53，耐熱、耐磨，但抗沖擊性差。堆焊鍋爐旋轉葉輪
	D 832	EDCoCr-C-03	HRc≥50. Wear and heat resistance. Hardfacing of high temperature part such as hot-rolling guided way. HRc≥50，耐熱、耐磨。堆焊高溫工件如熱軋導軌	ECoCr-C
	D 842	EDCoCr-D-03	HRc28-38. Corrosion and thermo-fatigue resistance, work harding. Hardfacing of hot forging die. HRc28-38，耐蝕、抗熱疲勞，具有加工硬化性。堆焊熱鍛模
Cast iron 鑄鐵	Z 308	EZNi	Pure nickel, excellent general properties. Used to weld thin cast iron part and repair welding machined surface, such as guided way of machine tool. 純鎳，綜合性能好。鑄鐵薄件及加工面補焊用，如機床導衛	ENi-Cl
	Z 408	EZNiFe	Iron nickel, high strength and excellent ductility. Repair welding of important gray cast iron and nodular cast iron, such as cylinder cap. 鎳鐵，強度高、塑性好。重要灰鑄鐵及球鐵焊補用，如汽缸蓋	ENiFe-Cl
	Z 508	EZNiCu-1	Copper nickel, good machinability and bad crack resistance. Repair welding of sand hole and gray cast iron machined surface subject to no load. 鎳銅，易加工，但抗裂性較差。不受力的灰鑄鐵加工面及砂眼補焊	ENiCu-B
Copper alloys 銅合金	Cu 107	ECu	Red copper, atmosphere and sea water corrosion and excellent electric conductivity. Welding of red copper such as electrical copper row. 紫銅，耐大氣，海水腐蝕，導電性好。紫銅焊接用，如導電銅排	ECu
	Cu 207	ECuSi	Silicon bronze, corrosion resistance and high strength. Welding of copper, silicon bronze and brass. 硅青銅，耐蝕、強度高。銅、硅青銅及黃銅焊接用	ECuSi
	Cu 227	ECuSnB	Tin phosphor bronze, corrosion resistance and high strength. Welding of copper, silicon bronze and brass. 錫磷青銅，耐蝕、強度高。銅、硅青銅及黃銅焊接用	ECuSn-C
	Cu 237	ECuAl	Aluminum bronze, wear and corrosion and high strength. Welding or surfacing of copper alloys. 鋁青銅，耐磨、耐蝕，強度高。銅合金焊接或堆焊用	ECuAl-A2
Aluminum alloys 鋁合金	Al 109	TAl	Pure aluminum, excellent corrosion resistance and middle strength. Welding of pure aluminum. 純鋁，耐蝕性好，但強度不高，純鋁焊接用	E1100
	Al 209	TAlSi	Silicon aluminum, good crack resistance and wide range of usage. Welding of aluminum alloys other than aluminum magnesium alloys. 鋁硅，抗裂性好，通用性大。鋁合金焊接用，不宜焊接鋁鎂合金	E4043
	Al 309	TAMn	Manganese aluminum, corrosion resistance and high strength. Welding of aluminum alloys. 鋁錳，強度高，耐蝕。鋁合金焊接用	E3003
Nickel alloys 鎳合金	Ni 102	ENi-1	Pure nickel. Welding and surfacing of nickel and nickel to steel. 純鎳，用于鎳、鎳與鋼的焊接與堆焊	ENi-1
Nickel alloys 鎳合金	Ni 207	ENiCu-7	Copper nickel. Welding and surfacing of copper nickel and copper nickel to steel. 鎳銅，用于鎳銅、鎳銅與鋼的焊接與堆焊	ENiCu-7

Category 類別	Trade mark 牌號	Chemical composition 主要成份(%)	Characteristics & application 特性和用途	Equivalent to AWS 相當AWS
Hardfacing 硬面堆焊	S 101	C3 Cr28 Ni4 Si3.5 Fe Rem.	HRc48-54. Resistance to wear, gas corrosion and oxidation. Hardfacing of bucket tooth and case pump. HRc48-54，耐磨、耐氣蝕、抗氧化。堆焊鏟斗齒，泵套
	S 111	C1 Cr29 W5 Co Rem.	HRc38-47. Resistance to wear and corrosion at high-temperature. Hardfacing of high temperature and pressure valve. HRc38-47，高溫下耐磨、耐蝕。堆焊高溫高壓閥門	ECoCr-A
	S 112	C1.5 Cr29 W8 Co Rem.	HRc45-50. Resistance to wear and corrosion at high-temperature. Hardfacing of valve and hot-rolling pass. HRc45-50，高溫下耐磨、耐蝕。堆焊閥門，熱軋孔型	ECoCr-B
	S 113	C2.5 Cr30 W17 Co Rem.	HRc≥55. Wear and heat resistance at high temperature, bad shock resistance. Hardfacing of screw charging carriage. HRc≥55，高溫下耐磨、耐熱，但抗沖擊性差。堆焊螺旋送料機用
	S 114	C2.5 Cr30 W12 Co Rem.	HRc≥53. Wear and heat resistance at high temperature, bad shock resistance. Hardfacing of three-cone bit. HRc≥53，高溫下耐磨、耐熱，但抗沖擊較差。堆焊牙輪鉆頭	ECoCr-C
Copper alloys 銅　合　金	S 201	Sn1 Si0.3Mn0.3 Cu Rem.	Good mechanical properties and crack resistance. Gas welding and argon arc welding of red copper. 機械性能好，抗裂性好。紫銅氣焊及氬弧焊用	ERCu
	S 211	Si3 Mn1 Cu Rem.	Good mechanical properties. Argon arc welding of copper alloys and MIG brazing of steel. 機械性能好，銅合金氬弧焊及鋼的MIG釬焊用	ERCuSi-Al
	S 212	Sn5 Cu Rem.	Wear resistance. Argon arc welding of copper alloys and surfacing of steel. 耐磨性好。銅合金氬弧焊及鋼的堆焊用	ERCuSn-A
	S 213	Sn8 Cu Rem.	Wear resistance. Argon arc welding of copper alloys and surfacing of steel. 耐磨性好。銅合金氬弧焊及鋼的堆焊用	ERCuSn-C
	S 214	Al7.5 Cu Rem.	Wear and corrosion resistance. Argon arc welding of copper alloys and surfacing of steel. 耐磨、耐蝕。銅合金氬弧焊及鋼的堆焊用	ERCuAl-A1
	S 215	Al9 Cu Rem.	Wear and corrosion resistance. Argon arc welding of copper alloys and surfacing of steel. 耐磨、耐蝕。銅合金氬弧焊及鋼的堆焊用	ERCuAl-A2
	S 221	Cu60 Sn1 Si0.3 Zn Rem.	Melting point is about 890℃. Gas welding and carbon arc welding of brass, also braze welding of copper, steel and cast iron. 熔點約890℃。黃銅氣焊及碳弧焊用，也可釬焊銅、鋼、鑄鐵
	S 221F	Cu60 Sn1 Si 0.3 Zn Rem.	S221 welding rod coated with flux. 外涂焊劑的S221焊絲
	S 222	Cu58Sn0.9Si0.1 Fe0.8 Zn Rem.	Melting point is about 880℃. Gas welding and carbon arc welding of brass, also braze welding of copper, steel and cast iron. 熔點約880℃。黃銅氣焊及碳弧焊用，也可釬焊銅、鋼、鑄鐵	RBCuZn-C
	S 222F	Cu58Sn0.9Si0.1 Fe0.8 Zn Rem.	S222 welding rod coated with flux. 外涂焊劑的S222焊絲	RBCuZn-C
	S 223	Cu59 Sn0.6 Zn Rem.	Melting point is about 900℃. Braze welding of copper, steel and cast iron. 熔點約900℃。銅、鋼、鑄鐵釬焊用	RBCuZn-A
	S 224	Cu62 Si0.5 Zn Rem.	Melting point is about 905℃. Gas welding and carbon arc welding of brass, also braze welding of copper, steel and cast iron. 熔點約905℃。黃銅氣焊及碳弧焊用，也可釬焊銅、鋼、鑄鐵
Copper alloys 銅合金	S 225	Cu48 Ni10 Zn Rem.	Melting point is about 935℃ and high strength. Braze welding of steel, nickel and carbide alloys. 熔點約935℃。高強度,釬焊鋼、鎳及硬質合金用	RBCuZn-D
	S 225F	Cu48 Ni10 Zn Rem.	S225 welding rod coated with flux. 外涂焊劑的S225焊絲	RBCuZn-D
	S 226	Cu60 Sn0.3 Si0.2 Zn Rem.	Melting point is about 900℃. Gas welding of brass, also braze welding of copper, steel and cast iron. 熔點約900℃。黃銅氣焊用，也可釬焊銅、鋼、鑄鐵
	S 227	Cu58Sn0.9Ni0.5 Si0.1 Fe0.8 Zn Rem.	Melting point is about 880℃. Gas welding and carbon arc welding of brass, also braze welding of copper, steel and cast iron. 熔點880℃。黃銅氣焊及碳弧焊用，也可釬焊銅、鋼、鑄鐵	RBCuZn-B
	S 229	Cu55 Ni6 Mn4 Zn余	Melting point is about 920℃, high strength. Braze welding of steel, nickel and hard carbide. 熔點約920℃。高強度,釬焊鋼、鎳及硬質合金用
Aluminum alloys 鋁合金	S 301	Al≥99.5	Good ductility and corrosion resistance. Gas welding and argon arc welding of pure aluminum. 塑性好、耐蝕。純鋁氣焊、氬弧焊用	ER1100
	S 311	Si5 Al Rem.	Corrosion resistance, wide range of usage. Gas welding and argon arc welding of aluminum alloys other than high magnesium alloys. 抗裂性好，通用性大。鋁合金氣焊、氬弧焊用。不宜用高鎂合金	ER4043
	S 321	Mn1.3 Al Rem.	Good corrosion resistance, weldability and ductility. Gas welding and argon arc welding of aluminum alloys. 良好的耐蝕性、可焊性及塑性。鋁合金氣焊、氬弧焊用
	S 331	Mg5 Mn0.4 Al Rem.	Corrosion resistance and high strength. Argon arc welding of aluminum alloys. 耐蝕，強度高。鋁合金氬弧焊用	ER5183

斯米克釬焊料分別有：（銅鋅釬焊料），（銅磷銀基釬焊料），（鋁基釬焊料），（錫鉛釬焊料），（鎳基釬焊料).簡介如下：

Category 類別	Trade-mark 牌號	Specification 規格	Melting Point 熔點(℃)	Chemical composition 主要成份(%)	Application 用途	Equivalent to AWS 相當AWS
Copper zinc 銅鋅	L103	Wire & rod 絲	885-888	Cu54 Zn Rem.	Brazing of copper, bronze and steel, subjected to low load. 釬焊銅、青銅和鋼等受力不大工件
Copper zinc 銅鋅	L104	Foil 箔	890-930	Cu57 Mn2 Co2 Zn Rem.	Brazing of carbide cutting tool. 釬焊硬質合金刀具
Copper phosphorus 　銅磷	L201	Cast rod, wire & rod, powder 鑄條、絲、粉	710-800	P7 Cu Rem.	Brazing of copper and copper alloys. 釬焊銅及銅合金	BCuP-2
	L204	Cast rod, wire 鑄條、絲	640-815	P5 Ag15 Cu Rem.	Brazing of copper, copper alloys, silver and molybdenum etc. 釬焊銅及銅合金、銀、鉬等金屬。	BCuP-5
	L205	Cast rod, wire & rod, powder 鑄條、絲、箔	640-800	P6 Ag5 Cu Rem.	Brazing of copper and copper alloys. 釬焊銅及銅合金	BCuP-3
	L207	Cast rod, wire & rod 鑄條、絲	640-770	P7 Ag5 Cu Rem.	Brazing of copper and copper alloys. 釬焊銅及銅合金	BCuP-7
	L209	Cast rod, wire 鑄條、絲	684-710	P7 Ag2 Cu Rem.	Brazing of copper and copper alloys. 釬焊銅及銅合金。	BCuP-6
Silver base 銀基	L302	Wire & rod 絲	745-775	Ag25 Cu40 Zn Rem.	Brazing of copper, copper alloys, steel and stainless steel etc. 釬焊銅及銅合金、鋼及不銹鋼等
	L303	Wire & rod 絲	660-725	Ag45 Cu30 Zn余	Brazing of copper, copper alloys, steel and stainless steel etc. 釬焊銅及銅合金、鋼及不銹鋼等	BAg-5
	L303F	Flux coated rod 涂藥絲	660-725	Ag45 Cu30 Zn Rem.	L303 coated with flux, the same application as L303. 外涂釬劑的L303，用途與L303相同	BAg-5
	L304	Foil 箔	690-775	Ag50 Cu34 Zn Rem.	Brazing of copper, copper alloys and steel etc. 釬焊銅及銅合金、鋼等	BAg-6
	L308	Wire & rod 絲	779-780	Ag72 Cu Rem.	Brazing of copper and nickel under vacuum or reducing protective atmosphere. 銅和鎳的真空或還原保護氣氛釬焊	BAg-8
	L312	Wire & rod 絲	595-605	Ag40.Cu.Zn.Cd	Brazing of copper, copper alloys, steel and stainless steel etc. 釬焊銅及銅合金、鋼及不銹鋼等
	L313	Wire & rod 絲	625-635	Ag50.Cu.Zn.Cd	Brazing of copper, copper alloys, steel and stainless steel etc. 釬焊銅及銅合金、鋼及不銹鋼等	BAg-1a
	L321	Wire & rod 絲	615-650	Ag56.Cu.Zn.Sn	Brazing of copper, copper alloys, steel and stainless steel etc. 釬焊銅及銅合金、鋼及不銹鋼等	BAg-7
	L323	Wire & rod 絲	665-755	Ag30.Cu.Zn.Sn	Brazing of copper, copper alloys, steel and stainless steel etc. 釬焊銅及銅合金、鋼及不銹鋼等
	L325	Wire & rod 絲	645-685	Ag45.Cu.Zn.Sn	Brazing of copper, copper alloys, steel and stainless steel etc. 釬焊銅及銅合金、鋼及不銹鋼等	BAg-36
	L326	Wire & rod 絲	650-720	Ag38.Cu.Zn.Sn	Brazing of copper, copper alloys, steel and stainless steel etc. 釬焊銅及銅合金、鋼及不銹鋼等	BAg-34
Aluminum base 鋁基	L400	Cast rod, wire & rod 鑄條、絲	577-582	Si11.5 Al Rem.	Brazing of aluminum and aluminum alloys. 鋁及鋁合金的釬焊	BAlSi-4
Aluminum base 鋁基	L401	Cast rod 鑄條	525-535	Si5 Cu28 Al Rem.	Brazing of aluminum and aluminum alloys. 鋁及鋁合金的釬焊
Tin lead 錫鉛	L600	Wire & rod 絲	183-185	Sn60 Sb≤0.8 Pb Rem.	Soldering of fusible metals and heat-treated part. 易熔金屬及熱處理件的釬焊	60Sn
	L601	Wire & rod 絲	183-227	Sn18 Sb2 Pb Rem.	Soldering of copper, copper alloys and galvanized iron plain sheet. 銅及銅合金、鍍鋅鐵皮的釬焊。	18Sn
	L602	Wire & rod 絲	183-256	Sn30 Sb2 Pb Rem.	Soldering of copper, brass, copper alloys and galvanized iron plain sheet. 銅、黃銅、鐵、鍍鋅鐵皮的釬焊	30Sn
	L603	Wire & rod 絲	183-235	Sn40 Sb2 Pb Rem.	Soldering of copper, copper alloys, steel and zinc parts. 銅及銅合金、鋼、鋅制零件的釬焊	40Sn
	L604	Wire & rod 絲	183-222	Sn90 Sb≤0.15 Pb Rem.	Soldering of copper and steel for food and medicine field. 食品、醫療所需銅、鋼等金屬的釬焊	90Sn
	L605	Wire & rod 絲	232-240	Ag5 Sn95	Soldering of copper and steel for electrical and food field. 電器、食品所需銅、鋼等金屬的釬焊
	L608	Wire & rod 絲	295-305	Sn5.5 Ag2.5 Pb Rem.	Soldering of copper, copper alloys, steel and stainless steel. 銅及銅合金、鋼及不銹鋼的釬焊
Nickel base 鎳基	L702	Powder 粉	970-1000	Cr7 B3 Si4 Ni Rem.	Brazing of stainless steel under vacuum or protective atmosphere. 不銹鋼真空或保護氣氛釬焊	BNi-2

Category 類別	Trade-mark 牌號	Product name 名稱	Characteristics & application 特性和用途
Gas welding 氣焊	CJ301	Copper gas welding flux 銅氣焊熔劑	Melting point is about 650℃, flux for gas welding and brazing of copper and copper alloys. 熔點約650℃，銅及銅合金氣焊或釬焊的助熔劑
Gas welding 氣焊	CJ401	Aluminum gas welding flux 鋁氣焊熔劑	Melting point is about 560℃, flux for gas welding of aluminum and aluminum alloys. 熔點約560℃，鋁及鋁合金氣焊的助熔劑
Silver brazing 銀釬焊	QJ101	Silver brazing flux 銀釬焊熔劑	Brazing flux of copper, copper alloys, steel and stainless steel within 550-750℃. 在550-750℃范圍釬焊銅及銅合金、鋼及不銹鋼的助熔劑
	QJ102	Silver brazing flux 銀釬焊熔劑	Brazing flux of copper, copper alloys, steel and stainless steel within 600-850℃. 在600-850℃范圍釬焊銅及銅合金、鋼及不銹鋼的助熔劑
	QJ102A	Silver brazing flux 銀釬焊熔劑	Brazing flux of copper, copper alloys, steel and stainless steel within 600-850℃. Non agglomeration. 在600-850℃范圍釬焊銅及銅合金、鋼及不銹鋼。不易結塊
	QJ112	Silver brazing paste flux 膏狀銀釬焊熔劑	Brazing flux of copper, copper alloys, steel and stainless steel within 600-850℃. 在600-850℃范圍釬焊銅及銅合金、鋼及不銹鋼的助熔劑
	QJ103	Silver brazing flux 銀釬焊熔劑	Brazing flux of copper, copper alloys, steel and stainless steel within 550-750℃. 在550-750℃范圍釬焊銅及銅合金、鋼及不銹鋼的助熔劑
Aluminum brazing 鋁釬焊	QJ201	Aluminum brazing flux 鋁釬焊熔劑	Brazing flux of aluminum and aluminum alloys within 450-620℃. 在450-620℃范圍釬焊鋁及鋁合金的助熔劑
Aluminum brazing 鋁釬焊	QJ207	Aluminum brazing flux 鋁釬焊熔劑	Brazing flux of aluminum and aluminum alloys within 560-620℃. 在560-620℃范圍釬焊鋁及鋁合金的助熔劑

Category 類別	Trade- mark 牌號	Chemical composition 化學成份(%)	Hardness 硬度	Application 用途
Oxy- Acetylene Flame spray- using 氧乙炔焰噴焊	F103	Cr10 B1.5 Si3 Ni Rem.	HRc 25	Spray-fusing of cast ir, on parts,,, such as die for glass, cylinder, and guide. 鑄鐵件的噴焊，如玻璃模具，汽缸、導軌
	F101	Cr10 B2.5 Si3 Ni Rem.	HRc 45	Spray-fusing of parts resistance to wear and corrosion, such as valve, the rotator and piston of pump. 耐磨、耐蝕件的噴焊，如閥門、泵轉子、泵柱塞
	F101Fe	Cr10 B2.5 Si3 Fe10 Ni Rem.	HRc 45	Spray-fusing of corrosion-resistant parts, such as axle and stigma. 耐磨件的噴焊，如軸類、汽門
	F102	Cr16 B4 Si4 Ni Rem.	HRc 60	Spray-fusing of parts resistance to wear, corrosion and high temperature oxidation, such as die and piston. 耐磨、耐蝕、抗高溫氧化工件的噴焊，如模具、柱塞
	F102Fe	Cr16 B4 Si4 Fe15 Ni Rem.	HRc 60	Spray-fusing of corrosion-resistant parts, such as axle and cold die. 耐磨件的噴焊，如軸類、冷模具
	F105	F102+50%WC	HRc 60	Spray-fusing of parts resistance to grain-wear , such as guide plate, scraper and blade of fan. 抗磨粒磨損場合的噴焊，如導板、刮板、風機葉片
	F105Fe	F102Fe+35%WC	HRc 60	Spray-fusing of parts resistance to grain-wear, such as guide plate, scraper and blade of fan. 抗磨粒磨損場合的噴焊，如導板、刮板、風機葉片
	F108	F102+80%WC	HRc 60	Spray-fusing of parts resistance to strong grain-wear and free machining, such as harrow teeth of dredger. 抗強烈磨粒磨損，無需加工場合的噴焊，如挖泥船耙齒
	F301	Cr5 B4 Si4 Ni30 Fe Rem.	HRc 45	Spray-fusing of vulnerable parts of agricultural machinery and mining machinery, such as gear and axletree. 農機,礦山機械易損件的噴焊，如齒輪，車軸
	Track iron powder 軌鐵粉	Cr5 B1.5 Si3 Ni30 Fe Rem.	HRc 28	Repair spray-fusing of defects such as scratch and concavity of railroad track. 鐵路鋼軌擦傷、低塌等缺陷的修復噴焊
Oxy-acetylene flame spraying 氧乙炔焰噴涂	F111	Cr5 B1.5 Si3 Ni30 Fe Rem.	HB 150	Spraying of bearing and cutting parts etc. 軸承、切削件等的噴涂
	F113	Cr10 B1.5 Si3 Ni Rem.	HB 250	Spray-fusing or spraying, such as roll, piston and axle of wear and corrosion resistance. 噴涂亦可噴焊，如滾筒、柱塞、耐蝕耐磨軸等
	F313	Cr15 B1.5 Fe Rem.	HB 250	Spraying of dryer of papermaking and axle. 造紙烘缸、軸類的噴涂
	F314	Cr18 Ni9 B1.5 Fe Rem.	HB 250	Spraying of axle. 軸類噴涂
	F412	Sn10 P0.3 Cu Rem.	HB 80	Spraying of axle and bearing. 軸、軸承的噴涂
	F512	復合Al5Ni95		Backing spray of transition layer between base and working layer. 噴涂層的基體與工作層之間過渡（打底）層用噴涂
PTA hardfacing 等離子弧噴焊	F221	Cr26 W5 B0.7 Co Rem.	HRc 43	PTA hardfacing of sealing surface of high temperature and high pressure valve and the edge of hot shearing tool. 高溫高壓閥門密封面、熱剪切刃口的等離子噴焊
	F223	Cr21 W5 B1.5 Co Rem.	HRc 40	PTA hardfacing of parts resistance to wear and corrosion at high temperature, such as valve under high temperature and high pressure, and blower. 高溫下耐磨耐蝕件的噴焊，如高溫高壓閥門、鼓風機
	F321	Cr13 B1.5 Si1 Fe Rem.	HRc 45	PTA hardfacing of corrosion-resistant parts under mid-temperature and mid-pressure, such as stop-plate etc. 中溫中壓閥門的閘板及其他耐磨件的等離子噴焊
	F322	Cr23 Ni13 Si5 B1 Fe Rem.	HRc 40	PTA hardfacing of corrosion-resistant parts under mid-temperature and mid-pressure, such as valve base etc. 中溫中壓閥門的閥座及其他耐磨件的等離子噴焊
	F422	Sn10 P0.3 Cu Rem.	HB 80	PTA hardfacing of axle and bearing etc. 軸、軸承等離子噴焊

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