Cold-rolled carbon steel sheet
Understanding Cold-Rolled Carbon Steel Sheet: The Basics
Cold-rolled carbon steel sheet exists because manufacturers want tighter tolerances and more consistent performance. It typically starts with hot-rolled coil, which is pickled to remove mill scale and surface oxides, then cold reduced to the target thickness, and finally annealed to restore ductility and stabilize the material.
Compared with hot-rolled steel, cold-rolled sheet delivers a noticeably smoother surface, better dimensional accuracy, more uniform thickness, and more consistent mechanical properties—making it well suited for demanding processes like stamping and precision bending.
Put simply: hot-rolled steel is “rough-machined,” while cold-rolled steel is “precision-finished.” If appearance and accuracy matter, cold-rolled is usually the better fit.
Key Characteristics of Cold-Rolled Carbon Steel Sheet
Standards
Cold-rolled carbon steel sheet is governed by a well-established global standards landscape. The most commonly referenced systems include:
- China: GB/T 5213; Baosteel enterprise standards such as Q/BQB 408 and Q/BQB 402
- Japan: JIS G3141 (SPCC, SPCD, SPCE series)
- United States: ASTM A1008/A1008M (CS, DS, DDS, EDDS series)
- Europe: EN 10130 (DC01, DC03, DC04, DC06 series)
- Germany: DIN 1623 (St12, St13, St14 series)
Grades across these systems can be cross-referenced through equivalency tables, which helps keep material specifications portable for international sourcing and multi-region production.
Standards Framework
Cold-rolled carbon steel sheet is specified under different national and regional standards, each with its own grade naming system. The major systems most commonly used in global sourcing include China (GB/T), Japan (JIS), the United States (ASTM), Europe (EN), and legacy German DIN grades. While grade names differ, they’re often cross-referenced to support international procurement and technical communication.
International Grade Cross-Reference Table
Cold-rolled carbon steel grades are named differently across standards, but the equivalency relationships are widely used as a practical reference for global sourcing and engineering discussions.
| Application class | Japan (JIS G3141) | China (GB/T) | Europe (EN 10130) | Germany (DIN 1623) | U.S. (ASTM A1008) |
|---|---|---|---|---|---|
| Commercial quality (CQ) | SPCC | DC01 / Q195 | DC01 | St12 | CS Type A/B/C |
| Drawing quality (DQ) | SPCD | DC03 | DC03 | St13 | DS Type A/B |
| Deep drawing quality (DDQ) | SPCE | DC04 | DC04 | St14 | DDS |
| Extra deep drawing quality (EDDQ) | SPCF | DC05 | DC05 | St15 | EDDS |
| Super extra deep drawing quality (SEDDQ) | SPCG | DC06 | DC06 | St16 | EDDS |
Notes
- CQ = Commercial Quality
- DQ = Drawing Quality
- DDQ = Deep Drawing Quality
- EDDQ = Extra Deep Drawing Quality
How to choose the right grade for sheet metal fabrication
Choose based on the forming process
| Process | Recommended grades | Why it’s a good fit |
|---|---|---|
| Simple bending, punching | SPCC / DC01 | Cost-effective and sufficient for general forming needs. |
| Moderate bending, light drawing | SPCD / DC03 | Better ductility, lower risk of cracking during forming. |
| Deep drawing, complex forming | SPCE / DC04 | Strong deep-draw performance, typically with higher r-values for drawability. |
| Ultra-deep drawing, very complex parts | SPCG / DC06 | Often associated with interstitial-free (IF) steel practice—best-in-class formability for demanding draws. |
Choose based on the end-use application
| Application | Recommended grades | Typical products |
|---|---|---|
| Electrical enclosures, chassis | SPCC / SECC | PC cases, electrical distribution boxes |
| Automotive outer panels (doors, hoods) | SPCE / DC04 / O5-grade | Passenger-car exterior panels |
| Appliance panels | SPCD / DC03 | Refrigerator door panels, washing machine panels |
| Oil pans, deep-drawn components | SPCE / DC06 | Automotive oil pans, filter housings |
| General structural parts | SPCC | Brackets, reinforcement plates |
| High-strength structural parts | HSLAS series (grade per spec) | Automotive structural parts |
Note: If you’re not sure which grade fits your design and forming route, reach out to SR MFG—our engineers can help you choose the most suitable material and specification.
Key Specifications for Cold-Rolled Carbon Steel Sheet
Chemical Composition
The chemical makeup of cold-rolled carbon steel sheet has a direct impact on both mechanical properties and formability, so each grade is controlled within specified composition limits.
Typical Chemical Composition Limits (by Grade)
| Grade | C (%) | Mn (%) | P (%) | S (%) | Al (%) | Si (%) |
|---|---|---|---|---|---|---|
| SPCC / DC01 | ≤0.15 | ≤0.60 | ≤0.035 | ≤0.025 | — | ≤0.05 |
| SPCD / DC03 | ≤0.10 | ≤0.50 | ≤0.030 | ≤0.025 | ≥0.015 | ≤0.05 |
| SPCE / DC04 | ≤0.08 | ≤0.45 | ≤0.025 | ≤0.020 | ≥0.015 | ≤0.05 |
| SPCF / DC05 | ≤0.06 | ≤0.45 | ≤0.025 | ≤0.020 | ≥0.020 | ≤0.05 |
| SPCG / DC06 | ≤0.02 | ≤0.25 | ≤0.020 | ≤0.020 | — | ≤0.05 |
| CS Type B | 0.02–0.15 | ≤0.60 | ≤0.030 | ≤0.035 | — | — |
| DS Type B | ≤0.06 | ≤0.50 | ≤0.030 | ≤0.035 | — | — |
| DDS | ≤0.06 | ≤0.50 | ≤0.020 | ≤0.030 | — | — |
| EDDS | ≤0.04 | ≤0.40 | ≤0.020 | ≤0.025 | — | — |
How composition affects performance (what the elements do)
- Carbon (C): Lower carbon generally improves ductility and drawability. For example, SPCG (DC06) is often specified with very low carbon (≤0.02%), making it well suited for ultra-deep drawing applications.
- Manganese (Mn): Helps increase strength and toughness, but excessive Mn can reduce formability.
- Phosphorus (P) & Sulfur (S): Typically treated as harmful impurities—the lower, the better. Higher levels can increase brittleness (cold brittleness and hot shortness).
- Aluminum (Al): Commonly used as a deoxidizer to improve steel cleanliness and ductility. It can also help suppress strain aging, reducing the risk of property shifts after forming.
Mechanical Properties
Typical Mechanical Property Reference (ASTM A1008)
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Notes |
|---|---|---|---|---|
| CS Type B (SPCC) | 140–275 | ≥270 | 28–40 | General-purpose; moderate strength |
| DS Type B (SPCD) | 140–240 | ≥270 | 30–42 | Drawing grade; better ductility |
| DDS (SPCE) | 115–200 | ≥270 | 38–42 | Deep drawing; higher r-value |
| EDDS (SPCG) | 105–170 | ≥270 | ≥40 | Extra-deep drawing; higher n-value |
| SS Grade 36 | ≥250 | 360 | 20–28 | Structural use; higher strength |
| HSLAS Grade 50 | ≥345 | ≥450 | ≥22 | High-strength low-alloy steel |
ASTM A1008 is a common reference for cold-rolled sheet and includes requirements related to yield strength, tensile strength, and elongation testing.
Elongation by Thickness (SPCC Reference)
| Nominal thickness (mm) | 0.25–0.30 | 0.30–0.40 | 0.40–0.60 | 0.60–1.0 | 1.0–1.6 | ≥1.6 |
|---|---|---|---|---|---|---|
| Elongation (%) | 25 | 28 | 31 | 34 | 36 | 37 |
What These Properties Mean
- Yield strength: The stress at which the material begins permanent (plastic) deformation. In general, lower yield strength forms more easily.
- Tensile strength: The maximum stress the material can withstand before fracture—an overall indicator of strength.
- Elongation: How much the material can stretch before breaking. Higher elongation generally means better formability; deep-drawn parts often target ≥40%.
- r-value (plastic strain ratio / Lankford coefficient): A measure of through-thickness thinning resistance during forming—higher r typically indicates better deep-draw performance.
- n-value (strain hardening exponent): Indicates how well the material can deform uniformly—higher n generally supports better stretch formability and reduces localized thinning.
Dimensional Specifications
General Size Range
| Parameter | Range | Common sizes | Notes |
|---|---|---|---|
| Thickness | 0.12–3.50 mm | 0.5 / 0.8 / 1.0 / 1.2 / 1.5 / 2.0 mm | Below 0.3 mm typically requires custom sourcing |
| Width | 400–1850 mm | 1000 / 1219 / 1250 / 1500 mm | Custom widths available per request |
| Sheet length | 1000–6000 mm | 2000 / 2438 / 3000 mm | 2438 mm = 8 ft |
| Coil weight | 3–20 tons | 5–15 tons | Custom coil weights available |
| Coil ID | 508 mm / 610 mm | 508 mm | Standard inner diameter |
Thickness Selection Guidelines
| Application | Recommended thickness (mm) | Why |
|---|---|---|
| Appliance housings | 0.5–0.8 | Lightweight while meeting strength needs |
| PC chassis / enclosures | 0.6–1.0 | Good balance of stiffness and cost |
| Automotive door panels | 0.7–0.8 | Supports deep draw requirements and surface quality |
| Automotive oil pans | 1.5–2.0 | Thicker wall for higher strength |
| Structural parts | 1.5–3.0 | Higher stiffness for load-bearing use |
Dimensional Specifications
Thickness Tolerance Standard
| Thickness range | Standard precision (PL.A) | Higher precision (PL.B) | Typical use |
|---|---|---|---|
| 0.3–0.4 mm | ±0.04 mm | ±0.03 mm | Precision stamped parts |
| 0.4–0.6 mm | ±0.05 mm | ±0.04 mm | Appliance panels |
| 0.6–1.0 mm | ±0.06 mm | ±0.05 mm | General structural parts |
| 1.0–2.0 mm | ±0.08 mm | ±0.06 mm | Thicker-gauge parts |
| 2.0–3.5 mm | ±0.10 mm | ±0.08 mm | Structural sheet |
Width Tolerance
| Edge condition | Width range | Permissible deviation | Notes |
|---|---|---|---|
| Slit edge (EC) | <1200 mm | 0 to +3 mm | Higher precision |
| Slit edge (EC) | 1200–1500 mm | 0 to +4 mm | Higher precision |
| Slit edge (EC) | >1500 mm | 0 to +5 mm | Higher precision |
| Mill edge (EM) | 730–1850 mm | 0 to +8 mm | Standard precision |
Length Tolerance (Sheets)
| Nominal length L | Standard precision (PL.A) | Higher precision (PL.B) |
|---|---|---|
| ≤2000 mm | 0 to +6 mm | 0 to +3 mm |
| >2000 mm | 0 to +0.003L | 0 to +0.0015L |
Flatness Requirement
| Flatness class | Flatness per meter | Typical use |
|---|---|---|
| Standard (PF.A) | ≤5 mm/m | General structural parts |
| Higher precision (PF.B) | ≤3 mm/m | Appliance housings, automotive parts |
Hardness Grades
Cold-rolled carbon steel sheet is commonly supplied in different temper (hardness) conditions depending on the annealing and temper-rolling route.
| Temper grade | HRB | HV | Characteristics | Typical applications |
|---|---|---|---|---|
| 1/8 Hard (8) | 50–71 | 95–130 | Relatively soft; suitable for light forming | Simple bent parts |
| 1/4 Hard (4) | 65–80 | 115–150 | Medium hardness with decent formability | General stamped parts |
| 1/2 Hard (2) | 74–89 | 135–185 | Harder with higher strength | Structural parts |
| Hard (1) | ≥85 | ≥170 | High hardness; limited formability | High-strength structural parts |
| Annealed (S) | — | 85–110 | Soft condition; best ductility | Deep-drawn parts |
| Full Hard (FH) | HRB ≥ 90 | HV ≥ 185 | Full hard; typically requires re-annealing for forming | Used for further rolling / as a substrate (e.g., for coated products) |
How to choose a hardness/temper
- For deep drawing, use the Annealed (S) condition.
- For general stamping, 1/4 Hard is often a practical choice.
- For structural parts, consider 1/2 Hard or Hard depending on forming needs.
- Full Hard material is typically selected as a base for downstream processing (and is generally not intended for forming unless re-annealed).
Surface Quality of Cold-Rolled Carbon Steel Sheets
Surface Finish Classification
Cold-rolled carbon steel sheets are typically classified into three finish levels based on surface quality requirements:
| Designation | Finish Level | Description | Typical Applications |
|---|---|---|---|
| FB / O3 | Commercial Finish | Minor surface imperfections are permitted, provided they do not affect formability or coating adhesion. These may include light scratches, roll marks, shallow dents, minor pitting, or slight discoloration. | General structural components, internal parts, equipment frames |
| FC / O4 | Drawing Quality Finish | Of the two surfaces, the better side must be free of visible defects to the naked eye. The reverse side must at least meet FB requirements. | Appliance housings, automotive interior panels, enclosure exteriors |
| FD / O5 | Exposed Quality Finish | Of the two surfaces, the better side must be completely free of defects that could affect the appearance after painting or electroplating. The reverse side must at least meet FB requirements. | Automotive exterior panels (doors, hoods, trunk lids), high-end appliance panels |
Finish Selection Guidelines:
- O3 (FB): Suitable for structural components, internal equipment parts, or parts that will undergo powder coating or painting in subsequent processes where surface appearance is not critical.
- O4 (FC): Recommended for parts with moderate appearance requirements, such as appliance casings, automotive interior trim, and visible cabinet surfaces.
- O5 (FD): Required for automotive exterior panels with high appearance standards. In China, only a limited number of steel mills can consistently produce stable O5-grade material, including Shougang Cold Rolling, HBIS Handan, and Shougang Jingtang.
Surface Condition
| Code | Surface Type | Roll Treatment | Appearance | Typical Applications |
|---|---|---|---|---|
| D | Matte Finish | Shot-blasted rolls | Uniform, fine-textured matte surface | Appliance panels, automotive outer panels |
| B | Bright Finish | Ground and polished rolls | Smooth, bright surface with high reflectivity | Precision components, electroplating substrates |
| — | Standard Finish | Standard rolls | Conventional mill finish | General-purpose applications |
Recommended Surface Combinations (for reference; final selection should be based on actual application requirements):
- Appliance exterior parts: D surface + FC/FD grade
- Automotive outer panels: D surface + FD grade
- General structural parts: Standard surface + FB grade
- Electroplating substrate: B surface + FC grade
Surface Roughness
Surface roughness is a critical parameter in evaluating sheet metal surface quality, as it directly affects subsequent surface treatment performance.
| Application | Recommended Ra | Inspection Method |
|---|---|---|
| Cold-rolled substrate | ≤ 1.6 μm | Surface roughness tester |
| Deep drawing grade (DC04 and above) | ≤ 0.8 μm | Surface roughness tester |
| O5 automotive panels | ≤ 0.6 μm | Surface roughness tester |
| Laser-cut edge | ≤ 12.5 μm | Surface roughness tester |
| Bent surface | ≤ 6.3 μm | Surface roughness tester |
Impact of Improper Surface Roughness on Subsequent Processing
- Excessive roughness: May cause orange peel or sagging during powder coating and can reduce plating adhesion.
- Insufficient roughness: Can lead to poor coating adhesion and potential peeling.
- Rough laser-cut edges: May negatively affect appearance and create localized stress concentrations.
Surface Defect Control
Forming Processes
Cold-rolled carbon steel offers excellent formability, making it suitable for components with varying levels of geometric complexity.
Bending
Bending is one of the most widely used sheet metal operations, and cold-rolled steel performs reliably in press brake forming.
| Parameter | Recommended Value | Notes |
|---|---|---|
| Minimum bend radius | ≥ 1.0t (t = sheet thickness) | Too small a radius can cause cracking. |
| Minimum flange length | ≥ 1.5t + bend radius | If the flange is too short, clamping becomes difficult and bending may fail. |
| Springback compensation | 1–3° | Adjust based on material grade and bend angle. |
| V-die opening (V-width) | 6–10 × sheet thickness | Select die size based on sheet thickness. |
Stamping
Cold-rolled steel sheet is one of the most suitable materials for stamping. Select the appropriate grade based on product complexity, then apply the required stamping operations.
| Stamping Type | Recommended Grade | Key Parameters |
|---|---|---|
| Simple blanking | SPCC / DC01 | Blanking clearance: 0.05–0.08t |
| General forming | SPCD / DC03 | Draw ratio ≥ 0.7 |
| Deep drawing | SPCE / DC04 | Draw ratio ≥ 0.6 |
| Extra-deep drawing | SPCG / DC06 | Draw ratio ≥ 0.55 |
Welding Processes
Cold-rolled carbon steel sheet offers good weldability and supports a variety of welding methods, as shown below.
| Welding Method | Suitability | Weld Quality | Typical Applications |
|---|---|---|---|
| GTAW (TIG) | Very good | Clean, attractive welds; minimal distortion | Precision parts, appearance-critical parts |
| CO₂ shielded welding | Good | High efficiency, low cost | Structural parts, mass production |
| Spot welding | Good | Ideal for lap joints on thin sheet | Automotive bodies, home appliances |
| Laser welding | Excellent | High precision, small heat-affected zone | Precision components |
| MIG welding | Very good | High welding speed | Medium-thickness sheet |
Common Welding Issues and Fixes
| Issue | Cause | Solution |
|---|---|---|
| Porosity | Insufficient shielding gas flow; oil/contamination on surface | Increase shielding gas flow; clean the joint area |
| Undercut | Current too high; travel speed too fast | Reduce current; slow down travel speed |
| Hot cracking | Carbon content too high; cooling too fast | Use low-carbon steel; control the cooling rate |
| Excessive distortion | Poor weld sequence; too much heat input | Optimize weld sequence; use skip/segment welding |
Surface Finishing Processes
Cold-rolled carbon steel sheet does have a downside: its corrosion resistance isn’t very strong. In most cases, a surface treatment is needed to extend service life.
Phosphate Coating
| Parameter | Requirement |
|---|---|
| Coating thickness | 2–5 μm |
| Appearance | Uniform gray film |
| Adhesion | Cross-hatch test: Class 1 |
| Corrosion resistance | Neutral salt spray ≥ 24 hours |
Electrostatic Powder Coating
| Parameter | Requirement |
|---|---|
| Coating thickness | 60–120 μm |
| Appearance | No runs/sags, no pinholes, no orange peel |
| Hardness | HV ≥ 400 |
| Corrosion resistance | Neutral salt spray ≥ 72 hours |
| Adhesion | Cross-hatch test: Class 1 |
E-Coating (Electrophoretic Deposition)
| Parameter | Requirement |
|---|---|
| Coating thickness | 15–30 μm |
| Appearance | Uniform and smooth |
| Hardness | Better than powder coating |
| Corrosion resistance | Neutral salt spray ≥ 240 hours |
Electro-Galvanizing
| Parameter | Requirement |
|---|---|
| Coating thickness | 5–10 μm |
| Appearance | Uniform silver-gray finish |
| Corrosion resistance | Neutral salt spray ≥ 48 hours |
| Electrical conductivity | Excellent |
Hot-Dip Galvanizing (SGCC)
| Parameter | Requirement |
|---|---|
| Coating thickness | 8–15 μm |
| Appearance | Spangle pattern or bright silver finish |
| Corrosion resistance | Neutral salt spray ≥ 96 hours |
Quick Guide for Choosing a Surface Finish
Industry Application Examples for Cold-Rolled Carbon Steel Sheet
Home Appliance Industry
| Product | Recommended Material | Thickness Range | Surface Finish | Key Requirements |
|---|---|---|---|---|
| Refrigerator door panel | SPCC / DC03 | 0.5–0.6 mm | Powder coating / pre-painted | High surface quality; good flatness |
| Refrigerator side panel | SECC / SGCC | 0.5–0.8 mm | Powder coating | Strong corrosion resistance |
| Washing machine inner tub | SPCD / SECC | 0.8–1.2 mm | Galvanizing + plastic coating | Good deep-draw performance |
| Washing machine cabinet | SPCC / SGCC | 0.8–1.0 mm | Powder coating | Good appearance |
| Air conditioner housing | SPCC / SGCC | 0.8–1.5 mm | Powder coating | Corrosion protection + appearance |
| Microwave oven housing | SECC | 0.6–0.8 mm | Powder coating / as-is | Corrosion resistance |
| PC chassis | SECC | 0.6–1.0 mm | Powder coating / as-is | EMI shielding |
| TV back panel | SPCC | 0.5–0.8 mm | Powder coating | Low cost |
Automotive Industry
| Component | Recommended Material | Thickness | Surface Quality | Key Performance Requirements |
|---|---|---|---|---|
| Inner door panel | DC03 / DC04 | 0.7–1.0 mm | FB/FC | Deep drawability |
| Outer door panel | DC04 / O5 grade | 0.7–0.8 mm | FD | High surface quality |
| Hood | DC04 / O5 grade | 0.8–1.0 mm | FD | Appearance + dent resistance |
| Decklid (trunk lid) | DC06 | 0.7–0.9 mm | FD | Extra-deep drawability |
| Roof panel | DC04 / O5 grade | 0.7–0.8 mm | FD | Flatness over large areas |
| Outer side panel | DC04 / O5 grade | 0.7–0.9 mm | FD | Large-radius / complex curvature forming |
| Floor pan | High-strength steel | 1.2–2.0 mm | FB | High strength |
| Oil pan | DC06 | 1.5–2.0 mm | FB | Extra-deep drawability + leak resistance |
| Seat frame | High-strength steel | 1.5–3.0 mm | FB | Strength + safety |
Telecom Equipment Industry
| Product | Recommended Material | Thickness | Surface Finish | Key Requirements |
|---|---|---|---|---|
| Server cabinet | SPCC / SGCC | 1.5–2.5 mm | Powder coating | Strength + corrosion resistance |
| Power distribution cabinet | SGCC | 1.2–2.0 mm | Powder coating | Corrosion resistance + safety |
| Network cabinet | SPCC / SGCC | 1.0–2.0 mm | Powder coating | Strength + appearance |
| Battery cabinet | SGCC | 1.5–2.5 mm | Heavy-duty powder coating | High corrosion resistance |
| Outdoor base station | SGCC | 2.0–3.0 mm | Heavy-duty powder coating | Weather resistance |
| Equipment frame | SPCC | 1.0–1.5 mm | Phosphate + powder coating | Strength + cost |
Building and Architectural Applications
| Product | Recommended Material | Thickness | Surface Finish | Key Requirements |
|---|---|---|---|---|
| Metal ceiling panels | SPCC | 0.5–0.8 mm | Powder coating / pre-painted | Flatness + appearance |
| Curtain wall panels | SPCC / SGCC | 1.0–2.5 mm | Powder coating / fluorocarbon coating | Weather resistance |
| Metal partitions | SPCC | 0.8–1.2 mm | Powder coating | Appearance + strength |
| Railings and handrails | SPCC / SGCC | 1.5–2.5 mm | Powder coating / galvanizing | Safety + corrosion resistance |
Hardware and Metal Products
| Product | Recommended Material | Thickness | Surface Finish | Key Requirements |
|---|---|---|---|---|
| Toolbox | SPCC / SECC | 0.8–1.5 mm | Powder coating / electro-galvanizing | Flatness + appearance |
| Metal enclosure/case | SECC / SGCC | 0.8–1.2 mm | Electro-galvanizing | Weather resistance |
| Filing cabinet | SECC | 0.6–1.0 mm | Powder coating | Appearance + strength |
| Shelving | SPCC / SGCC | 1.0–2.0 mm | Powder coating | Safety + corrosion resistance |
| Hardware parts | SPCC | 0.5–1.5 mm | Electro-galvanizing | Precision + corrosion resistance |
Cost Breakdown for Cold-Rolled Carbon Steel Sheet
Material Costs
- 1
Raw materials: 60–70% of total cost
- 2
Pricing is heavily affected by fluctuations in steel billet and hot-rolled coil prices
- 3
Typical grade pricing trend: SPCC < SPCD < SPCE
Processing Costs
- 1
Cold rolling: 10–15%
- 2
Annealing, temper rolling (skin-pass), and oiling: 5–10%
- 3
Cut-to-length and slitting: 3–5%
Packaging and Transportation
- 1
Packaging: 2–3%
- 2
Domestic transportation: 1–2%
- 3
Ocean freight: Not included in FOB pricing; included in CIF pricing
Overhead and Profit
- 1
Administrative overhead: 3–5%
- 2
Financing costs: 2–3%
- 3
Profit margin: 5–10%
Key Factors That Affect Pricing
| Factor | Impact Level | Notes |
|---|---|---|
| Raw material prices | High | Driven by swings in iron ore and coke prices |
| Market supply and demand | Moderate | Prices typically rise during peak seasons |
