What is ASTM A387 Gr.11 Alloy Steel Plates?
ASTM A387 Gr.11 Alloy Steel Plates Specification
|
Product Name |
ASTM A387 Grade 11 Alloy Steel Plates |
|
Material |
A387 Gr.11 CL1/CL2 |
|
Thcikness |
6~130mm as Required |
|
Width |
1500~4100mm as Required |
|
Length |
3000~12000mm as Required |
|
Tolerance |
1% |
|
Standard |
ASTM A387 |
|
Technique |
Hot Rolled |
ASTM A387 Gr.11 Cr-Mo Steel Plates Chemical Composition
| Element | Heat Analysis | Product Analysis |
|---|---|---|
| C | 0.05‑0.17 | 0.04‑0.17 |
| Mn | 0.40‑0.65 | 0.35‑0.73 |
| Si | 0.50‑0.80 | 0.44‑0.86 |
| Cr | 1.00‑1.50 | 0.94‑1.56 |
| Mo | 0.45‑0.65 | 0.40‑0.70 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.025 | ≤0.025 |
ASTM A387 Gr.11 Cr-Mo Steel Plates Mechanical Property
| Item | ASTM A387 Gr11 Class 1 | ASTM A387 Gr11 Class 2 |
|---|---|---|
| Tensile Strength | 415‑585 MPa (60‑85 ksi) | 515‑690 MPa (75‑100 ksi) |
| Minimum Yield Strength | 240 MPa (35 ksi) | 310 MPa (45 ksi) |
| Elongation (50 mm gauge) | ≥22 % | ≥22 % |
| Elongation (200 mm gauge) | ≥19 % | ≥18 % |
ASTM A387 Gr.11 Chrome-Moly Steel Plates Key Performance Characteristics
High‑Temperature Creep Resistance
Designed for long‑term continuous service at temperatures up to 593 °C, delivering stable creep‑rupture performance for boiler and refinery equipment.
Acid‑Medium Resistance and Hydrogen‑Resistant Properties
Suitable for service in wet hydrogen sulfide (H₂S) and hydrogen‑rich process‑media environments. For projects under acidic‑service conditions, HIC (Hydrogen‑Induced Cracking) and SSCC (Sulfide Stress‑Corrosion Cracking) testing options are available.
Controllable Weldability
With appropriate pre‑heat and post‑weld heat treatment (PWHT), the risk of cold cracking during fabrication can be mitigated.
Toughness Performance
Charpy impact testing down to ‑46 °C can be performed upon customer request to satisfy low‑temperature start‑up service requirements.
ASTM A387 Gr.11 Chrome-Moly Plates Welding and Post‑Weld Heat Treatment (PWHT)
A387 Grade 11 is a chromium‑molybdenum (Cr‑Mo) alloy steel. Improper welding procedures may lead to cold cracking and excessive hardness.
Recommended Process Key Points:
- Minimum pre‑heat temperature of 149 °C, with interpass temperature maintained throughout welding.
- Applicable welding processes: SMAW, GTAW, GMAW, FCAW. Matching Cr‑Mo alloy consumables shall be used.
- Post‑weld heat treatment: Soaking temperature range of 650 °C‑700 °C; soaking time shall be determined based on plate thickness.
- Rapid cooling shall be avoided following hot forming operations. For cutting operations, plasma cutting or saw cutting is preferred. Cut edges within weld joint zones shall be ground.
ASTM A387 Gr.11 Plates Wide Industry Applications
A387 Gr11 alloy steel plates are widely adopted in global energy and chemical industries:
- Oil refinery: Hydro‑processing reactor components, reformer towers, high‑temperature heat exchangers.
- Thermal power plant: Boiler drums, superheater headers, high‑temperature shell sections.
- Chemical plants: Medium‑high temperature high‑pressure reactors, sour‑media storage vessels.
- Oil & gas industry: Sour‑service pressure vessels, process buffer equipment.
Why Choose Us As Your A387 Gr11 Supplier?
- Strict quality control: Our past shipment statistics show 99.2 % one‑pass third‑party inspection rate. Every batch is traceable to original mill heat number. We support third‑party witness inspection before shipment. If material fails specification compliance, we take full responsibility for replacement.
- Inventory & processing capacity: We maintain regular stock of A387 Gr11 Class1 / Class2 plates for common thickness range. Our in‑house processing workshop supports cutting, bevel and blasting, delivering finished parts instead of raw heavy plates. Normal lead‑time for stocked items: 7‑14 working days; for heavy thick plate production order: 30‑45 working days.
- Complete export service: We are familiar with documentation requirements for North America, Middle‑East, Southeast Asia projects. Full set shipping documents can be issued in one batch to avoid delay at customs clearance.
- Project references: We have supplied A387 Gr11 plates for power‑plant and refinery projects located in Indonesia, Kazakhstan, Belgium and other regions.
FAQ
What is the difference between ASTM A387 and ASME SA387 Grade 11?
There is no technical difference in material, chemistry, or mechanical properties between ASTM A387 Grade 11 and ASME SA387 Grade 11. They are identical standards; the ASTM version is managed for general industrial use, while the ASME ("SA") version is adopted for boiler and pressure vessel codes.
What standard is equivalent to SA 387 GR.11?
The standard equivalent to ASME SA 387 Gr 11 (a 1.25% Chromium, 0.5% Molybdenum alloy steel plate) is ASTM A387 Grade 11 in the United States. International equivalents include EN 13CrMoSi5-5 (European Union), DIN 17155 13CrMo44 (Germany), and BS 620B / BS 621B (United Kingdom).
What is the difference between ASTM A387 Gr.11 Cl 1 and Cl2?
ASTM A387 Grade 11 Class 1 and Class 2 share the exact same chemical composition (nominally 1.25% Chromium and 0.50% Molybdenum), but differ in their heat treatment, mechanical strength requirements, and impact toughness. Class 2 provides higher tensile and yield strength properties tailored for more demanding conditions.
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