对于氢化硫(H₂S)及碳化氢(烃类)这类酸性应用环境，美国克雷恩提供NACE阀门供用户选择，这类阀门部件材料经过特殊热处理和硬化处理，符合NACE标准MR0175。美国克雷恩铸钢闸阀典型的NACE材料配置 如下所示。
　　For servicing sour environments of Hydrogen Sulfide (H₂S) bearing hydrocarbons, Crane offers NACE valves made of component materials specially heat-treated and hardness-controlled in compliance with NACE standard MR0175. Typical NACE material configurations are shown below for Crane cast steel gate valves.

1. 阀体和阀盖 - 对于22 HRC标准材料进行热处理和最大硬化处理的大多数NACE要求是ASTM A216等级WCB。
   Body & Bonnet – Most NACE requirements for heat treatment and maximum hardness of 22 HRC. Standard material is ASTM A216 Grade WCB.
2. 螺栓 - ASTM A193等级B7M螺栓和ASTM A194等级2HM螺母符合NACE类别I和II的要求。
   Bolting – ASTM A193 Grade B7M bolts and ASTM A194 Grade 2HM nuts meet both NACE Classes I and II.
3. 阀杆 - 具有优异的抗应力腐蚀破裂性能，标准配置的NACE阀杆是符合NACE硬化和热处理要求的316不锈钢。
   Stem – Offering superior resistance to stress corrosion cracking, standard NACE stem is type 316 stainless steel in conformance with NACE hardness and heat treatment requirements.
4. 阀瓣 - 标准阀瓣是一件式弹性楔形阀瓣，材料为ASTM A351等级CF8M，316不锈钢，符合NACE硬化和热处理要求。
   Disc – Standard disc is one piece flexible wedge ASTM A351 Grade CF8M, type 316 stainless steel in conformance with NACE hardness and heat treatment requirements.