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银色镜面不锈钢用英语怎么说

危机的黄豆
羞涩的铃铛
2023-03-22 14:37:21

银色镜面不锈钢用英语怎么说

最佳答案
专一的荔枝
饱满的香菇
2026-05-01 10:24:28

银色镜面不锈钢

Silver mirror stainless steel

不锈钢 stainless steel

不锈钢板 corrosion resistant plate

不锈钢表面氧化处理 malcolmizing

不锈钢管 stainless steel tube

不锈钢焊接 austenite welding

不锈钢焊条 stainless steel electrode

不锈钢冶炼法 rustless process

例句:

工人们正在铸造一座不锈钢的胸像。

The workers are casting a stainless steel bust.

刀锋似乎是不锈钢,说明了刀其实是最近才出产的,然后被某人赋予了神奇的力量。

The blade appears to be stainless steel, indicating that it is of recent manufacture and then empoweredby someone.

希望能帮助到你,记得采纳我的答案!

最新回答
风趣的音响
勤奋的戒指
2026-05-01 10:24:28

不锈钢专业常用英语术语:

Professional words (stainless steel)

Weld 焊接

Stainless不锈的

Steel钢

Pipe管

Tube管

Outside diameter 外径

Wall thickness内壁厚度

Seamless pipes无缝管

Polish抛光

Pickling酸洗

Corrosion-resistant防腐蚀

Stainless steel round tubes不锈钢圆管

Stainless steel square tubes不锈钢方管

Rectangle tubes矩管

Screwy tubes螺纹管

Embossed tubes=empaistic tubes压花管

FBizarre tubes异形管

Tolerance公差

Flat head平口

steel钢

Lcrude steel粗钢

mild steel, soft steel 软钢,低碳钢

hard steel 硬钢

Hcast steel坩埚钢,铸钢

stainless steel不锈钢

Velectric steel电工钢,电炉钢

high-speed steel高速钢

moulded steel铸钢

Orefractory steel热强钢,耐热钢

alloy steel合金钢

Frolling mill轧机,轧钢机

heating 加热

Hpreheating预热

dtempering回火

temper回火

hardening淬水

Zannealing退火

reduction还原

cooling冷却

Erolling轧制

zdrawing拉拔

Rextrusion挤压

bwiredrawing拉丝

coiled sheet带状薄板

bloom初轧方坯

Wmetal strip, metal band铁带,钢带

billet坯锭,钢坯

shavings剃边

profiled bar异型钢材

shape, section型钢

angle iron角钢

plate, sheet薄板

ferrite 铁素体

waustenite奥氏体

Nmartensite马氏体

cementite 渗碳体

iron carbide 渗碳体

solid solution 固溶体

sorbite 索氏体

bainite 贝氏体

forging 锻(件)

Ycasting 铸(件)

Jrolling 轧(件)

ndrawing 拉(件)

shot blasting 喷丸(处理)

grit blasting 喷钢砂(处理)

sand blasting 喷砂(处理)

Acarburizing 渗碳

Nnitriding 渗氮

zcreep 蠕变

deflection 挠度

elongation 延伸率

alloy tool steel合金工具钢

aluminium alloy铝合金钢

bearing alloy轴承合金

blister steel浸碳钢

bonderized steel sheet邦德防蚀钢板

carbon tool steel碳素工具钢

clad sheet被覆板

clod work die steel冷锻模用钢

emery金钢砂

ferrostatic pressure钢铁水静压力

forging die steel锻造模用钢

galvanized steel sheet镀锌铁板

hard alloy steel超硬合金钢

high speed tool steel高速度工具钢

hot work die steel热锻模用钢

low alloy tool steel特殊工具钢

low manganese casting steel低锰铸钢

marging steel马式体高强度热处理钢

martrix alloy马特里斯合金

meehanite cast iron米汉纳铸钢

meehanite metal米汉纳铁

merchant iron市售钢材

molybdenum high speed steel钼系高速钢

molybdenum steel钼钢

nickel chromium steel镍铬钢

prehardened steel顶硬钢

silicon steel sheet矽钢板

stainless steel不锈钢

tin plated steel sheet镀锡铁板

tough pitch copper韧铜

troostite吐粒散铁

tungsten steel钢

vinyl tapped steel sheet塑胶覆面钢板

Shrunk收缩

Stave穿孔

金GP-gold plated

亮镍BRN-bright nickel

黑镍BN(US15A)-black nickel

亮铜BB(US3)-bright brass

铜拉丝BB(US4)-brass brushed

亮铬BC(US26)-bright chrome

金拉丝GB-gold brushed

镀镍NP-nickel plated

镍拉丝NB(US15)-nickel brushed

镀铬CP-chrome plated

铬拉丝CB(US26D)-chrome brushed

镀铜PB(US3-4)-plating brass

不锈钢拉丝SSB(US32D)-stainless steel brushed

镀锌ZP(US2G)-zinc plated

枪黑拉丝BNB-black nickel brushed

铜抛光BP-brass polished

青古铜AB(US10B)-antique bronze

不锈钢抛光SSP(US32)-stainless steel polished

红古铜AC(US5)-antique copper

不锈钢SS-stainless steel

砂金SG-satin gold

喷漆SPA(USP)-spray painting

砂镍SN-satin nickel

黑漆BL-black lacquer

暗金(粉金)Dark GP-dark gold plated

alloy tool steel合金工具钢

aluminium alloy铝合金钢

bearing alloy轴承合金

blister steel浸碳钢

bonderized steel sheet邦德防蚀钢板

carbon tool steel碳素工具钢

clad sheet被覆板

clod work die steel冷锻模用钢

emery金钢砂

ferrostatic pressure钢铁水静压力

forging die steel锻造模用钢

galvanized steel sheet镀锌铁板

hard alloy steel超硬合金钢

high speed tool steel高速度工具钢

hot work die steel热锻模用钢

low alloy tool steel特殊工具钢

low manganese casting steel低锰铸钢

marging steel马式体高强度热处理钢

martrix alloy马特里斯合金

meehanite cast iron米汉纳铸钢

meehanite metal米汉纳铁

merchant iron市售钢材

molybdenum high speed steel钼系高速钢

molybdenum steel钼钢

nickel chromium steel镍铬钢

prehardened steel顶硬钢

silicon steel sheet矽钢板

tin plated steel sheet镀锡铁板

tough pitch copper韧铜

troostite吐粒散铁

tungsten steel钢

vinyl tapped steel sheet塑胶覆面钢板

光亮漆BRL-bright lacquer

手酸啦!贴不下啦!

感性的皮带
拉长的西装
2026-05-01 10:24:28
化工管道设计技术词汇(中英对照完整版)

1 管道组成件 Piping component

1.1 管子 Pipe

管子(按照配管标准规格制造的) pipe

管子(不按配管标准规格制造的其他用管) tube

钢管 steel pipe

铸铁管 cast iron pipe

衬里管 lined pipe

复合管 clad pipe

碳钢管 carbon steel pipe

合金钢管 alloy steel pipe

不锈钢 stainless steel pipe

奥氏体不锈钢管 austenitic stainless steel pipe

铁合金钢管 ferritic alloy steel pipe

轧制钢管 wrought-steel pipe

锻铁管 wrought-iron pipe

无缝钢管 seamless (SMLS) steel pipe

焊接钢管 welded steel pipe

电阻焊钢管 electric-resistance welded steel pipe

电熔(弧)焊钢板卷管 electric-fusion (arc)-welded steel-plate pipe

螺旋焊接钢管 spiral welded steel pipe

镀锌钢管 galvanized steel pipe

热轧无缝钢管 hot-rolling seamless pipe

冷拔无缝钢管 cold-drawing seamless pipe

水煤气钢管 water-gas steel pipe

塑料管 plastic pipe

玻璃管 glass tube

橡胶管 rubber tube

直管 run pipestraight pipe

1.2 管件 Fitting

弯头 elbow

异径弯头 reducing elbow

带支座弯头 base elbow

k半径弯头 long radius elbow

短半径弯头 short radius elbow

长半径180°弯头 long radius return

短半径180°弯头 short radius return

带侧向口的弯头(右向或左向) side outlet elbow (right hand or left hand)

双支管弯头( 形) double branch elbow

三通 tee

异径三通 reducing tee

等径三通 straight tee

带侧向口的三通(右向或左向) side outlet tee (right hand or 1eft hand)

异径三通(分支口为异径) reducing tee (reducing on outlet)

异径三通(一个直通口为异径)reducing tee (reducing on one run)

带支座三通 base tee

异径三通(一个直通口及分支口为异径) reducing tee (reducing on one run and outlet)

异径三通(两个直通口为异径,双头式) reducing tee (reducing on both runs, bull head)

45°斜三通 45° lateral

45°斜三通(支管为异径) 45° lateral (reducing on branch)

45°斜三通(一个直通口为异径) 45° lateral (reducing on one run)

45°斜三通(一个直通口及支管为异径) 45° lateral (reducing on one run and branch)

Y型三通(俗称裤衩) true “Y”

四通 cross

等径四通 straight cross

异径四通 reducing cross

异径四通(一个分支口为异径)reducing cross (reducing on one outlet)

异径四通(一个直通口及分支口为异径) reducing cross (reducing on one run and outlet)

异径四通(两个分支口为异径) reducing cross (reducing on both outlet)

异径四通(一个直通口及两个分支口为异径) reducing cross (reducing on one run and both outlet)

异径管 reducer

同心异径管 concentric reducer

偏心异径管 eccentric reducer

锻制异径管 reducing swage

螺纹支管台 threadolet

焊接支管台 weldolet

承插支管台 sockolet

弯头支管台 elbolet

斜接支管台 latrolet

镶入式支管嘴 sweepolet

短管支管台 nipolet

支管台,插入式支管台 boss

管接头 coupling, full coupling

半管接头 half coupling

异径管接头 reducing coupling

活接头 union

内外螺纹缩接(俗称补芯) bushing

管帽 cap (C)

堵头 plug

短节 nipple

异径短节 reducing nippleswage nipple

1.3 弯管 Bend

预制弯管 fabricated pipe bend

跨越弯管(^ 形) cross-over bend

偏置弯管(~ 形) offset bend

90°弯管 quarter bend

环形弯管 cirele bend

单侧偏置90°弯管(? 形) single offset quarter bend

S形弯管 “S” bend

单侧偏置U形膨胀弯管(| ?形) single offset “U” bend

U形弯管 “U” bend

双偏置U膨胀弯管 double offset expansion “U” bend

斜接弯管 mitre bend

三节斜接弯管 3-piece mitre bend

折皱弯管 corrugated bend

圆度 roundness

1.4 法兰 Flange (FLG)

整体管法兰 integral pipe flange

钢管法兰 steel pipe flange

螺纹法兰 threaded flange

滑套法兰(包括平焊法兰) slip-on flange (SO)slip-on welding flange

承插焊法兰 socket welding flange

松套法兰 lap joint flange (LJF)

对焊法兰 welding neckflange (WNF)

法兰盖 blind flange, blind

孔板法兰 orifice flange

异径法兰 reducing flange

盘座式法兰 pad type flange

松套带颈法兰 loose hubbed flange

焊接板式法兰 welding plate flange

对焊环 welding neck collar (与stub end相似)

平焊环 welding-on collar

突缘短节 stub end, lap

翻边端 lapped pipe end

松套板式法兰 loose plate flange

压力级 pressure rating, pressure rating class

压力—温度等级 pressure-temperature rating

法兰密封面,法兰面 flange facing

突面 raised face (RF)

凸面 male face (MF)

凹面 female face (FMF)

榫面 tongue face

槽面 groove face

环连接面 ring joint face

全平面;满平面 flat facefull face (FF)

光滑突面 smooth raised face (SRF)

法兰面加工 facing finish

粗糙度 roughness

光滑的 smooth

齿形 serrated

均方根 root mean square (RMS)

算术平均粗糙高度 arithmetical average roughness height (AARH)

配对法兰 companion-flange

螺栓圆 bolt circle (B.C.)

1.5 垫片 Gasket (GSKT)

垫片的型式 type of gasket

平垫片 flat gasket

环形平垫片 flat ring gasket

平金属垫片 flat metal gasket

夹棉织物的橡胶 elastomer with cotton fabric insertion

夹石棉织物的橡胶 elastomer with asbestos fabric insertion

夹石棉织物及金属丝加强的橡胶 elastomer with asbestos fabric insertion and with wire reinforcement

无石墨压缩白石棉垫片 non graphited compressed white asbestos gasket

天然白橡胶垫片 natural white rubber gasket

压缩石棉垫片 compressed asbestos class gasket

浸聚四氟乙烯的石棉垫片 PTFE impregnated asbestos gasket

夹石棉的缠绕金属垫片 spiral-wound metal gasket with asbestos filler

内环 inner ring

外环,外定位环 outer ring

波纹金属垫片 corrugated metal gasket

波纹金属包嵌石棉垫片 corrugated metal gasket with asbestos inserted

双夹套波纹金属包石棉垫片 corrugated metal double jacketed asbestos filled gasket

双夹套垫片 double jacketed gasket

金属包石棉平垫片 flat metal jacketed asbestos filled gasket

整体金属齿形垫片 solid metal serrated gasket

槽形金属垫片 grooved metal gasket

环形连接金属垫片 ring joint metal gasket

八角环形垫片 octagonal ring gasket

椭圆环形垫片 oval ring gasket

透镜式垫片 lens gasket

非金属垫片 non-metallic gasket

1.6 阀门 Valve

1.6.1 阀门结构、零件

阀轭 yoke

外螺纹阀杆及阀轭 outside screw and yoke (OS &Y)

阀杆 stem

内螺纹 inside screw (IS)

阀轭套 yoke sleeve

阀杆环 stem ring

阀座 valve seat (body seat)

阀座环、密封圈 seat ring

整体(阀)座 integral seat

堆焊(阀)座 deposited seat

阀芯(包括密封圈、杆等内件) trim

阀盘 disc

阀盘密封圈 disc seat

阀体 body

阀盖 bonnet

阀盖衬套 bonnet bush

螺纹阀帽 screw cap

螺纹阀盖 screw bonnet

螺栓连接的阀盖 bolted bonnet (BB)

活接阀盖(帽) union bonnet (cap)

螺栓连接的阀帽 bolted cap (BC)

焊接阀盖 welded bonnet (WB)

本体阀杆密封 body stem seal

石棉安全密封 asbestos emenen seal

倒密封 back seal

压力密封的阀盖 pressure-tight bonnet

动力操纵器 powered operator

电动操纵器 electric motor operator

气动操纵器 pneumatic operator

液压操纵器 hydraulic operator

快速操纵器 quick-acting operator

滑动阀杆 sliding stem

正齿轮传动 spur gear operated

伞齿轮传动 bevel gear operated

扳手操作 wrench operated

链轮 chain wheel

手轮 hand wheel

手柄 hand lever (handle)

气缸(或液压缸)操纵的 cylinder operated

链条操纵的 chain operated

等径孔道 full borefull port

异径孔道 reducing bore, reduced port,venturi port

短型 short pattern

紧凑型(小型) compact type

笼式环 lantern ring

压盖 gland

阀杆填料 stem packing

阀盖垫片 bonnet gasket

升杆式(明杆) rising stem (RS)

非升杆式(暗杆) non-rising stem (NRS)

指示器/限位器 indicator/stopper

注油器 grease injector

可更换的阀座环 renewable seat ring

1.6.2 常用阀

(1)闸阀 gate valve

平行双闸板 double disc parallel seat

开口楔形闸板 split wedge

挠性整体楔形闸扳 flexible solid wedge

整体楔形闸板 solid wedge

塞型闸阀 plug gate valve

直通型闸阀 through conduit gate valve

(2) 截止阀 globe valve

球心型阀盘 globe type disc

塞型阀盘 plug type disc

可转动的阀盘 swivel disc

(3) 节流闪阀 throttle valve

针阀 needle valve

(4) 角阀 angle valve

(5) Y型阀(Y 型阀体截止阀) Y-valve (Y-body globe valve)

(6) 球阀 ball valve

三通球阀 3-way ball valve

装有底轴的 trunnion mounted

耐火型 fire safe type

浮动球型 floating ball type

防脱出阀杆 blowout proof stem

(7) 蝶阀 butterfly valve

对夹式(薄片型) wafer type

凸耳式 lug type

偏心阀板蝶阀 offset disc burerfly valveeccentric butterfly valve

斜阀盘蝶阀 canted disc butterfly valve

连杆式蝶阀 link butterfly valve

8) 柱塞阀 piston type valve

(9) 旋塞阀 plug valve

三通旋塞阀 three-way plug valve

四通旋塞阀 four-way plug valve

旋塞 cock

衬套旋塞 sleeve cock

(10) 隔膜阀 diaphragm valve

橡胶衬里隔膜阀 rubber lined diaphragm valve

直通式隔膜阀 straight way diaphragm valve

堰式隔膜阀 weir diaphragm valve

(11) 夹紧式胶管阀 pinch valve(用于泥浆、粉尘等)

(12) 止回阀 check valve

升降式止回阀 lift check valve

旋启式止回阀 swing check valve, flap check valve

落球式止回阀 ball check valve

弹簧球式止回阀 spring ball check valve

双板对夹式止回阀 dual plate wafer type check valve

无撞击声止回阀 non-slam cheek valve

底阀 foot valve

切断式止回阀 stop check valvenon-return valve

活塞式止回阀 piston check valve

斜翻盘止回阀 tilting disc check valve

蝶式止回阀 butterfly check valve

1.6.3 其它用途的阀

安全泄气阀 safety valve (SV)

安全泄液阀 relief valve (RV)

安全泄压阀 safety relief valve

杠杆重锤式 lever and weight type

引导阀操纵的安全泄气阀 pilot operated safety valve

复式安全泄气阀 twin type safety valve

罐底排污阀 flush-bottom tank valve

电磁阀 solenoid valve, solenoid operated valve

电动阀 electrically operated valve, electric-motor operated valve

气动阀 pneumatic operated valve

低温用阀 cryogenic service valve

蒸汽疏水阀 steam trap

机械式疏水阎 mechanical trap

浮桶式疏水阀 open bucket trap, open top bucket trap

浮球式疏水阀 float trap

倒吊桶式疏水阀 inverted bucket trap

自由浮球式疏水阀 loose float trap

恒温式疏水阀 thermostatic trap

金属膨胀式蒸汽疏水阀 metal expansion steam trap

液体膨胀式蒸汽疏水阀 liquid expansion steam trap

双金属膨胀式蒸汽疏水阀 bimetallic expansion steam trap

压力平衡式恒温疏水阀 balanced pressure thermostatic trap

热动力式疏水阀 thermodynamic trap

脉冲式蒸汽疏水阀 impulse steam trap

放气阀(自动放气阀) air vent valve (automatic air vent valve) (疏水阀用)

平板式滑动闸阀 slab type sliding gate valve

盖阀 flat valve

换向阀 diverting valve, reversing valve

热膨胀阀 thermo expansion valve

自动关闭阀 self-closing gate valve

自动排液阀 self-draining valve

管道盲板阀 line-blind valve

挤压阀 squeeze valve(用于泥浆及粉尘等)

呼吸阀 breather valve

风门、挡板 damper

减压阀 pressure reducing valve, reducing valve

控制阀 control valve

膜式控制阀 diaphragm operated control valve

执行机构 actuator

背压调节阀 back pressure regulating valve

差压调节阀 differential pressure regulating valve

压力比例调节阀 pressure ratio regulating valve

1.6.4 未指明结构(或阀型)的阀

切断阀 block valveshut-off valvestop valve

调节阀 regulating valve

快开阀 quick opening valve

快闭阀 quick closing valve

隔断阀 isolating valve

三通阀 three way valve

夹套阔 jacketed valve

非旋转式阀 non-rotary valve

排污阀 blowdown valve

集液排放阀 drip valve

排液阀 drain valve

放空阀 vent valve

卸载阀 unloading valve

排出阀 discharge valve

吸入阀 suction valve

多通路阀 multiport valve

取样阀 sampling valve

手动阀 hand-operated valvemanually operated valve

锻造阀 forged valve

铸造阀 cast valve

(水)龙头 bibbbibfaucet

抽出液阀(小阀) bleed valve

旁路阀 by-pass valve

软管阀 hose valve

混合阀 mixing valve

破真空阀 vacuum breaker

冲洗阀 flush valve

第一道阀;根部阀 primary valve

根部阀 root valve

总管阀 header valve

事故切断阀 emergency valve

健壮的砖头
丰富的茉莉
2026-05-01 10:24:28
呵呵,我只是喜欢英语,但我不是学这个专业的,因为看你挺急的,所以我就尽我所能的来帮你找的O(∩_∩)O

铜出水 copper water

铜杆阀芯 copper spool

塑杆阀芯 Plastic rod spool

钢管 steel tube

钢弯接 Steel Bending Access

铜杆 brazing

铜六面平帽 Flat cap surface of copper 6

锌体锌弯接 Zinc Zinc body then bends

矮墙罩 A low wall cover

塑出锌帽 Plastic cap out of Zinc

椭圆形柄帽 Oval-shaped handle cap

25CM管子 25CM tubes

一般铜六角柄帽 General Copper Hexagonal handle cap

铜七通 Copper seven-pass

30CM管子铜出 30CM out of copper pipe

铜中间芯子 Copper intermediate wick

偏芯 core shift

28.3*12.8六角铜帽 28.3 * 12.8 Hexagon brass cap

钢弯接 Steel Bending Access

锌七通 Zn 7-pass

锌偏芯 Zinc partial core

铜中间芯子 Copper intermediate wick

铜体钢管 Copper Pipe Body

花条形软管 Flower bar hose

高义花洒 Vogel shower

铜方单孔 Copper Square hole

锌方单孔 Zinc Square Single Hole

铜菜盆 Copper Kitchen

不锈钢管 stainless steel tube

铝菜盆 Aluminum Kitchen

7子斜支架 7 sub-angle bracket

铜方厨房 Copper Square Kitchen

铜小四通 Copper Small Stone

锌小四通 Zinc Small Stone

锌弯接 Zinc Bend Access

斜支架 Angle bracket

铜元宝 Copper ingot

铜圆头单孔 Copper round hole

高义单孔 Gao Yi-hole

铜高义淋浴 Copper Vogel shower

伞形高管 Umbrella executives

不锈钢编织管 Stainless Steel Braided Hose

蛇头单孔 Smugglers hole

蛇头三联 Snakeheads triple

弯厨房 Bend Kitchen

铜大四通 Copper Big Stone

锌五通 Zinc 5-pass

锌六角帽 Zinc Hex cap

锌水位 Zinc level

铁管 iron tube iron pipe

锌六角平帽 Zinc Hexagon flat cap

呵呵,希望对你有所帮助!!祝事业成功!!

幽默的香水
高贵的仙人掌
2026-05-01 10:24:28
不锈钢英文stainless steel. 钢的编号和表示方法

①用国际化学元素符号和本国的符号来表示化学成份,用阿拉伯字母来表示成份含量:

如:中国、俄国 12CrNi3A

②用固定位数数字来表示钢类系列或数字;如:美国、日本、300系、400系、200系;

③用拉丁字母和顺序组成序号,只表示用途。

我国的编号规则

①采用元素符号

②用途、汉语拼音,平炉钢:P、 沸腾钢:F、 镇静钢:B、甲类钢:A、T8:特8、GCr15:滚珠

◆合结钢、弹簧钢,如:20CrMnTi 60SiMn、(用万分之几表示C含量)

◆不锈钢、合金工具钢(用千分之几表示C含量),如:1Cr18Ni9 千分之一(即0.1%C),不锈 C≤0.08%

如0Cr18Ni9,超低碳C≤0.03% 如0Cr17Ni13Mo

国际不锈钢标示方法

美国钢铁学会是用三位数字来标示各种标准级的可锻不锈钢的。其中:

①奥氏体型不锈钢用200和300系列的数字标示,

②铁素体和马氏体型不锈钢用400系列的数字表示。例如,某些较普通的奥氏体不锈钢是以201、 304、 316以及310为标记,

③铁素体不锈钢是以430和446为标记,马氏体不锈钢 是以410、420以及440C为标记,双相(奥氏体-铁素体),

④不锈钢、沉淀硬化不锈钢以及含铁量低于50%的高合金通常是采用专利名称或商标命名。

4).标准的分类和分级

4-1分级:

①国家标准GB

②行业标准YB

③地方标准

④企业标准Q/CB

4-2 分类:

①产品标准

②包装标准

③方法标准

④基础标准

4-3 标准水平(分三级):

Y级:国际先进水平

I级:国际一般水平

H级:国内先进水平

4-4国标

GB1220-84 不锈棒材(I级)

GB4241-84 不锈焊接盘园(H级)

GB4356-84 不锈焊接盘园(I级)

GB1270-80 不锈管材(I级)

GB12771-91 不锈焊管(Y级)

GB3280-84 不锈冷板(I级)

GB4237-84 不锈热板(I级)

GB4239-91 不锈冷带(I级)