20R HIC Steel Plate Applications & Ordering Guide
20R (GB 6654) / Q245R base with HIC / sour-service options as ordered is specified for industrial fabrications where the drawing or material list names this grade. This applications page explains where the grade is used, what service conditions drive selection, and which certificate details belong on the purchase order. Gangsteel supplies 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered with EN 10204 mill test certificates.
Typical Applications and Service Conditions
20R (GB 6654) / Q245R base with HIC / sour-service options as ordered plate is ordered for pressure equipment, process vessels, heat-exchanger related fabrications, structural members under the governing code, and project packages that call the grade by name. Match the mill test certificate grade mark to the calculation sheet; do not treat near-equivalents as automatic substitutes.
Service drivers include the design temperature and pressure of the governing code (ASME, EN/PED, class society, or project specification), weld procedure qualification needs, toughness or creep allowables where applicable, and inspection scope. Delivery condition Normalized common for vessel service; HIC-tested heats when ordered should be stated explicitly on the purchase order.
Industry Use Cases
Pressure equipment and process: shells, heads, and related platework when drawings name 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered. Power and energy: boiler and heat-recovery fabrications under the ordered edition. Marine / offshore (when classed): only when the society material list names this exact grade stamp. Always keep heat-number traceability on cut pieces.
Chemical Composition - Supporting Data (20R (GB 6654) / Q245R base with HIC / sour-service options as ordered)
Base chem is 20R / Q245R. HIC/NACE extras (ultra-low S, Ca treatment, TM0284 Solution A/B CLR/CTR/CSR limits, hardness) are purchaser requirements - confirm on PO/MTC; do not invent a single HIC chem as the GB book.
| Element / rule | Requirement |
|---|
| C, max (20R / Q245R base) | 0.20 |
| Si (20R) | 0.15-0.30 |
| Mn (20R) | 0.40-0.90 |
| P, max (base book) | 0.035 |
| S, max (base book) | 0.030 |
| P / S for HIC heats (typical purchaser) | often P<=0.010 / S<=0.003 - confirm PO |
Mechanical Properties - Supporting Data (20R (GB 6654) / Q245R base with HIC / sour-service options as ordered)
Confirm thickness, specimen orientation, and any supplementary impact, UT, or hardness requirements on the PO.
| Property | Requirement |
|---|
| Yield, min (20R / Q245R typical) | 205-245 MPa by thickness / book |
| Tensile | 390-520 MPa (20R typical) / Q245R per GB/T 713 |
| Elongation, min | ~25% typical thin plate |
| HIC test | NACE TM0284 when ordered |
Related / Near-Equivalent Grades
Near-equivalents are for cross-reference only. They are not automatic code substitutes. Substitution requires engineer approval and matching certificate scope.
| System | Grade | Note |
|---|
| GB/T 713 | Q245R | Modern successor to 20R |
| ASTM | A516 Grade 55/60 + HIC (approx.) | Not identical |
Frequently Asked Questions
Where is 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered typically applied?
20R (GB 6654) / Q245R base with HIC / sour-service options as ordered is applied where design documents, class material lists, or purchaser specs name this grade for pressure, process, structural, or marine fabrications as applicable. Match the MTC marking to the drawing.
What service conditions drive selection of 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered?
Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition Normalized common for vessel service; HIC-tested heats when ordered must align with the ordered specification.
Can a near-equivalent replace 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered on an applications drawing?
Not without redesign and written approval. Near-equivalents differ in chemistry, heat treatment, impact temperature, or product form. Commercial swaps create non-conformance when the dossier names 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered.
What fabrication notes matter for 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered?
Use approved WPS/PQR packages for the thickness and filler, control heat input, and preserve heat-number traceability on cut pieces. State any supplementary UT, PMI, or impact tests on the purchase order.
What certificate and marking should an applications PO demand?
EN 10204 3.1 is standard; 3.2 when a purchaser-appointed inspector witnesses tests. The MTC should show heat analysis, tensile results, delivery condition, and heat number aligned with 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered.
How should I RFQ 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered plate from Gangsteel for a project?
Send 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered, thickness x width x length (or nesting list), quantity, delivery condition, optional NDT/PMI, certificate type, destination, and any dual-mark needs. Note the end use when special flatness or cut-to-size packaging is required.
Ordering and Mill Certificates
State grade 20R (GB 6654) / Q245R base with HIC / sour-service options as ordered, dimensions, quantity, delivery condition, optional NDT/PMI, and certificate (EN 10204 3.1 standard; 3.2 when third-party inspection is ordered). Gangsteel supplies export plate and related products with mill test certificates. Contact Gangsteel for stock and mill production RFQs.
