Purchasers must specify:

• Quantity (length, number of tubes)
• Material designation (e.g., P235GH, 13CrMo4-5)
• Dimensions (outer diameter, wall thickness, length)
• Delivery condition (e.g., normalized, tempered)
• Testing requirements (e.g., impact testing, NDT)
• Inspection documents (e.g., EN 10204 Type 3.1 or 3.2)
• Special requirements (e.g., hydrogen compatibility, additional tests)

Non-Alloy Steels (for Elevated Temp Service)

Alloy Steels (Cr-Mo & Heat-Resistant Grades)

Room Temperature Requirements

• Creep resistance data provided for long-term high-temp service.
• Impact testing required for certain grades (e.g., -20°C or -50°C).

Mandatory Tests

• Tensile test (per EN ISO 6892-1)
• Hydrostatic test (or non-destructive testing (NDT) if agreed)
• Flattening test / Bend test (for certain sizes)
• Impact test (if specified, per EN ISO 148-1)

• Ultrasonic testing (UT) or eddy current testing (ET)
• Grain size analysis
• High-temperature tensile testing
• Hardness testing

• EN 10204 Type 3.1 (mandatory) – Manufacturer’s self-certification.
• EN 10204 Type 3.2 (if required) – Independent inspection.
• Traceability (heat number, manufacturing process).

• Permanent marking: Grade, size, manufacturer, heat number, standard.
• Surface finish: Free from defects affecting performance.

• S1: Special cleanliness (e.g., for hydrogen service).
• S2: Additional NDT (e.g., full-body ultrasonic testing).
• S3: Specific heat treatment conditions.

• Power plants (boiler tubes, super-heaters)
• Oil & gas (pressure vessels, heat exchangers)
• Chemical industry (high-temp piping)

Non-Alloy Steel Grades

Molybdenum (Mo) Steels

Chromium-Molybdenum (Cr-Mo) Steels

Advanced High-Temperature Steels

• EN 10216-2 X10CrMoVNb9-1 ≈ ASTM A335 P91
• EN 10216-2 13CrMo4-5 ≈ ASTM A335 P12
• EN 10216-2 10CrMo9-10 ≈ ASTM A335 P22