Project Description
ASTM A182 F12 is a 1Cr-0.5Mo low-alloy forged steel supplied by SHUNFU METAL for refinery flanges, boiler pressure parts, petrochemical valve bodies, and high-temperature piping components. The forged-grade counterpart to A335 P12 seamless pipe, F12 delivers reliable elevated-temperature strength up to 540°C with proven resistance to oxidation and hydrogen attack in hydrogen-rich process environments. Available in Class 1 and Class 2, F12 forgings are a cost-effective alternative to higher-alloy ASME F11 forgings where a 1% chromium content suffices—making them widely specified for B16.5 flanges, heat exchanger components, and steam piping forgings in moderate-severity refinery and power generation service.
Introduction to ASTM A182 F12
ASTM A182 F12 is a 1Cr-0.5Mo forged alloy steel standardized under ASTM A182/A182M for forged or rolled pipe flanges, forged fittings, valves, and parts for high-temperature service. Its UNS designations are K11562 (Class 1) and K11564 (Class 2). The 1% chromium content provides oxidation resistance and hot strength while maintaining superior fabricability and lower alloy cost compared to 1.25Cr grades. F12 is the forged counterpart to A335 P12 pipe, A213 T12 tube, and A387 Gr.12 plate—forming a complete 1Cr-0.5Mo piping system family. SHUNFU METAL produces F12 forged bars from EAF + LF + VD refined heats, open-die forged on our 6,000-ton hydraulic press, and normalized-and-tempered to Class 1 or Class 2 property levels with full digital furnace chart traceability for every bar.
Equivalent & Cross-Reference Grades for F12
| Standard / Designation | Grade / Material | Product Form |
|---|---|---|
| ASTM A182 / ASME SA-182 | F12 Class 1 & 2 | Forgings & forged bars |
| ASTM A335 / ASME SA-335 | P12 | Seamless pipe |
| ASTM A213 | T12 | Heat exchanger & boiler tube |
| ASTM A387 | Gr.12 Class 1 & 2 | Pressure vessel plate |
| ASTM A234 | WP12 | Buttweld pipe fittings |
| DIN / EN | 13CrMo4-5 / 1.7335 | Forgings & bars |
| DIN (obsolete) | 13CrMo44 | Forgings & plates |
| GB (China) | 15CrMo / NB/T 47008 | Forgings & plate |
| GOST (Russia) | 12ХМ | Forgings & pipe |
| UNI (Italy) / AFNOR (France) | 14CrMo3 / 15CD4-05 | Forgings / bars |
F12 Applications in Oil & Gas, Refinery & Power
ASME B16.5 Class 150-2500 flanges for refinery and steam piping up to 540°C
Forged body and bonnet forgings for API 600/602 valves in moderate-temperature service
Forged tube plates for feedwater heaters, intercoolers, and process exchangers
Forged nozzle necks, manway covers, and reinforcement pads for refinery pressure vessels
Forged end caps, downcomer stub forgings, and riser nozzles for utility boiler drums
Forged inner casings and nozzle chambers for HP/IP steam turbines at 510-540°C
Forged cylindrical headers, end closures, and stub connections for superheater assemblies
Socket-weld and threaded tees, elbows, couplings, and unions to ASME B16.11
Forged tube hangers, intermediate supports, and guide brackets for fired heaters
Forged pump bodies, discharge heads, and barrel housings for boiler feed and process pumps
Forged swing check discs, hinge pins, and seat rings for high-temperature process lines
API 6A casing head bodies, tubing head adapters, and crossover spools for moderate-pressure wells
F12 Bar Supply Range
SHUNFU METAL supplies ASTM A182 F12 steel in the following bar dimensions, forged on our 6,000-ton hydraulic open-die press and rolled on our GFM radial forging line:
| Product Form | Diameter / Thickness (mm) | Width (mm) | Length (mm) | Condition |
|---|---|---|---|---|
| Forged Round Bar | 100 – 1,200 | — | 1,000 – 12,000 | N+T / Q+T |
| Hot-Rolled Round Bar | 10 – 500 | — | 3,000 – 9,000 | Annealed / As-rolled |
| Forged Flat Bar | 50 – 500 | 100 – 1,500 | 1,000 – 6,000 | N+T / Q+T |
| Hot-Rolled Flat Bar | 3 – 120 | 20 – 610 | 3,000 – 9,000 | Annealed / As-rolled |
| Forged Rings / Sleeves | OD 200 – 4,000 | Height 50 – 1,000 | Per drawing | N+T + rough machined |
| Forged Blocks / Discs | Thk 80 – 600 | 200 – 1,500 | 200 – 1,500 | N+T / Q+T + machined |
All F12 bars originate from EAF + LF + VD double-refined heats forged at 1,100–1,200°C initial temperature with finishing above 850°C. Forged bars undergo controlled slow cooling in insulated pits to prevent hydrogen-induced flaking and ensure homogeneous through-thickness properties. SHUNFU METAL performs optical emission spectrometry (OES) verification on every heat and maintains complete melt-to-bar traceability per our API Q1-certified quality system.
Chemical Composition of ASTM A182 F12 (wt.%)
| Element | F12 Class 1 | F12 Class 2 |
|---|---|---|
| Carbon (C) | 0.05–0.15 | 0.10–0.20 |
| Manganese (Mn) | 0.30–0.60 | 0.30–0.80 |
| Phosphorus (P) max | 0.045 | 0.040 |
| Sulfur (S) max | 0.045 | 0.040 |
| Silicon (Si) | ≤0.50 | 0.10–0.60 |
| Chromium (Cr) | 0.80–1.25 | 0.80–1.25 |
| Molybdenum (Mo) | 0.44–0.65 | 0.44–0.65 |
SHUNFU METAL Internal Controls:
Low residuals: P+S typically controlled to ≤0.012% through EAF+LF+VD double refining, exceeding ASTM Class 1’s 0.045% P/S limits by a wide margin for improved toughness and weldability.
Tramp element limits: Sn, As, Sb each ≤0.010% to minimize temper embrittlement during long-term elevated-temperature exposure above 375°C.
J-factor = (Si+Mn)×(P+Sn)×10&sup4; ≤ 150 for critical hydrogen service forgings per API 934-A / API 934-C requirements.
Carbon equivalent CE = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 typically ≤ 0.57, ensuring excellent field weldability with standard AWS E8018-B2 / ER80S-B2 consumables and minimal preheat requirements (150–200°C).
Mechanical Properties of F12 (ASTM A182)
| Property | Class 1 | Class 2 |
|---|---|---|
| Tensile Strength Rm (min) | 415 MPa (60 ksi) | 485 MPa (70 ksi) |
| Yield Strength Rp0.2 (min) | 220 MPa (32 ksi) | 275 MPa (40 ksi) |
| Elongation in 4D (min) | 20% | 20% |
| Reduction of Area (min) | 45% | 30% |
| Brinell Hardness (HBW) | 121–174 | 143–207 |
Heat Treatment Requirements:
Class 1: Full anneal at ≥900°C (furnace cool), or Normalize ≥900°C (air cool) + Temper ≥620°C. Minimum holding time: 1 h per 25 mm of ruling section thickness.
Class 2: Normalize ≥900°C (air cool) + Temper ≥620°C. Same holding time rule applies. Quench-and-temper is permitted as an alternative per agreement with purchaser.
All F12 bars produced by SHUNFU METAL are furnace heat-treated with calibrated temperature uniformity surveys (±10°C), automated chart recorders, and full-cycle time-temperature data traceable in every MTC.
NACE MR0175 / ISO 15156: Max hardness 22 HRC (237 HBW) for sour service applications when post-weld heat treated at ≥620°C minimum.
PWHT per ASME B31.3: 704–746°C, hold 1 h per 25 mm, minimum 1 hour. Weld preheat: 150–250°C.
Typical Elevated-Temperature Strength (N+T condition): Yield strength at 400°C ≈ 175 MPa; at 500°C ≈ 140 MPa; at 540°C ≈ 105 MPa. Creep rupture strength at 500°C / 100,000 h ≈ 98 MPa—suitable for most refinery heater and steam piping applications within the 540°C maximum recommended service temperature. For applications exceeding 540°C, consider upgrading to ASTM A182 F11 (1.25Cr-0.5Mo) or F22 (2.25Cr-1Mo). SHUNFU METAL can provide supplemental creep rupture test reports per EN 10291 upon request.
Certifications: EN 10204 3.1 / 3.2 | API Q1 / ISO 9001:2015 | ISO 14001 | ISO 45001 | PED 2014/68/EU Annex I Section 4.3 | NACE MR0175 / ISO 15156 | NORSOK M-650 Ed.4 QTR | Ultrasonic Testing per SEP 1921 / EN 10228-3 Class 2 & 3 | MT & PT per ASME BPV Section V | Charpy V-notch impact at −29°C to −46°C per ASTM A370 | Positive Material Identification (PMI) per API 578 | Weld procedure qualification records (PQR/WPS) available
