NACE MR0175/ISO 15156-2015, Petroleum and natural gas industries—Materials for use in H2S-containing environments in oil and gas production
NACE is the National Association of Corrosion Engineers, NACE publishes many documents related to corrosion control including NACE MR0175 which provides the requirements for metallic materials exposed to H2S in oil and gas production environments.
NACE MR0175 lists the requirements for carbon steels, low alloys and corrosion resistant alloys. For each material group, NACE MR0175 provides the following metallurgical requirements:
- Chemistry
- Hardness
- Heat treatment
- HIC resistance etc
A105 Chemical Composition
| C | Mn | P | S | Si |
| .35 max | .60/1.05 | .040 max | .05 max0 | .35 max |
Normally ASTM A105 NACE MR 0175 compliance mateial ,the P composition should be less than 0.015% and S should be less than 0.01%.
A105 Hardness requirement to comply with NACE MR 0175
If the A105 flange or fittings states fully comply with NACE MR 0175,187 HBW maximum hardness requirement.
A105 Flange Heat treatment requirement
For flanges size large than NPS 4 Class and pressure higher than 300lbs,
heat treamtnet should be conducted,Normally Normallized
Assume the certification is for an ASTM A105 NPS 4 Class 300 weld-neck flange. ASTM A105 allows this flange to be delivered in the as-hot-forged condition, with no subsequent heat treatment. All of the versions of NACE MR0175 specifically allow ASTM A105 forgings provided they meet a 187 HBW maximum hardness requirement, which is the standard maximum hardness requirement listed in ASTM A105. In other words, all versions of NACE MR0175 provide a specific waiver of the standard carbon steel heat treatment requirements for ASTM A105 material. However, NACE MR0103 does not include this specific waiver for ASTM A105 material. NACE MR0103 requires the material be subsequently heat-treated by annealing, normalizing, normalizing and tempering, or quenching and tempering. Therefore, without further information about the heat-treatment condition, conformance with NACE MR0103 cannot be verified.
We can produce the A105 FLange fully comply wtih NACE MR 0175 requirement
ASTM/ASME/ANSIB16.5, B16.47, ASME/ANSIB16.48 flange
slip on flange, Weld Neck Flange Threaded Flange Blind Flange, Orifice Flange socket weld flange, Spacer Ring, Paddle, Spectacle Blind Flange
Size 1/2″-120″ (DN15-DN3000)
Pressure: Class150-Class2500
Facing RF/FF / RTJ
Standard: ASTM/ASME/ANSIB16.5, ASME/ANSI B16.3and B16.47, ASME/ANSIB16.42, JIS/KS (5K, 10K, 16K, 20K), DIN2633, DIN2634, DIN2635,EN1092,BS4504,AWWA C206,API 6A ,Customized drawings welcomed
stainless steel :A 182 F 304/304L/316/316L/321/347, Duplex F51/F53/F44/F55/F60/F61
Alloy steel :STM A694/ A694M F42/F46/F52/F56/F60/F70,A182 F5,F9,F11,F22
Carbon steel:ASTM A 105, ST37.2 A 350 LF1, LF2, LF3,API 6A AISI 4130
Inspection: In house and third party
Document: MTC Comply with EN10204 3.1 can be provided prior to shipment
