Q370R Pressure Vessel Steel Plate

National Standard GB/T 713.2-2023 | Normalized / Normalized + Tempered | Pressure Vessel Grade

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Product Overview

Q370R is a low-alloy high-strength pressure vessel steel plate conforming to GB/T 713.2-2023 standard. It features excellent plasticity, toughness, and weldability, widely used in petroleum, chemical, power station boilers, and pressure vessel manufacturing.

Main Applications: Large storage tanks, spherical tanks, heat exchangers, reactors, and other pressure-bearing equipment, operating temperature -20℃ ~ 400℃.

Delivery Condition & Key Parameters

  • Thickness Range 6mm ~ 150mm (Negotiable)
  • Heat Treatment Normalized or Normalized + Tempered (per GB/T 713.2-2023)
  • Executive Standard GB/T 713.2-2023 (Replaces GB 713-2014)
  • NDT Level NB/T 47013.3 Level I/II/III Optional

Q370R Melting Chemical Composition (Mass Fraction, %) — GB/T 713.2-2023

Q370R Melting Chemical Composition per GB/T 713.2-2023
Grade Chemical Composition (Quality Fraction)/%
Cᵃ Si Mn Cu Ni Cr Mo Nb V Ti Altᵇ P S Others
Q370R ≤0.18 ≤0.55 1.20~1.70 ≤0.30 ≤0.30 ≤0.30 ≤0.08 0.015~0.050 ≤0.050 ≤0.030 ≤0.020 ≤0.010 Cu+Ni+Cr+Mo ≤0.70ᶜ
Note: ᵃ When thickness > 60mm, C content upper limit can be increased to 0.20%; ᵇ Alt indicates acid-soluble aluminum, which can be replaced by total aluminum content, with total Al ≥ 0.020; ᶜ Cu+Ni+Cr+Mo total ≤ 0.70. Specific values subject to mill certificate.

Main Functions of Chemical Elements

Carbon (C) ≤0.18% — Increases strength and hardness; controlled upper limit ensures weldability
Silicon (Si) ≤0.55% — Deoxidizer, increases strength, improves elastic limit
Manganese (Mn) 1.20~1.70% — Solid solution strengthening, improves strength and toughness, offsets sulfur hot brittleness
Niobium (Nb) 0.015~0.050% — Micro-alloying, grain refinement, significantly improves strength and toughness
Vanadium (V) ≤0.050% — Micro-alloying, precipitation strengthening, grain refinement
Titanium (Ti) ≤0.030% — Grain refinement, nitrogen fixation, improves HAZ toughness
Cr+Ni+Cu+Mo ≤0.70% — Improves hardenability and strength; total control ensures weldability
Phosphorus (P) ≤0.020% — Harmful element; strictly controlled to ensure toughness
Sulfur (S) ≤0.010% — Harmful element; strictly controlled to prevent hot brittleness
Aluminum (Alt) ≥0.020% — Strong deoxidizer, grain refinement, improves impact toughness

Q370R original designation was 15MnNbR; Niobium is its core micro-alloying element, significantly improving toughness and weldability while maintaining strength.

Q370R Core Advantages

  • ✓ Strength Advantage — Yield strength ≥370MPa, higher than Q345R (≥345MPa), enables weight reduction design
  • ✓ Low Temperature Toughness — -20℃ impact ≥47J, suitable for low temperature conditions
  • ✓ Weldability — Low carbon equivalent (CEV ≤0.45%), low welding crack sensitivity
  • ✓ Normalized Condition — Uniform structure, stable performance, especially suitable for large pressure vessels
  • ✓ International Alternatives — Can correspond to European standard P355NH, P355NL1, P355N and US standard SA-516 Gr.70 (low temperature impact), proven in export projects

Room Temperature Mechanical Properties (Transverse)

Q370R Room Temperature Mechanical Properties
Yield Strength ReL (MPa) ≥370 (thickness≤60)
≥360 (60~100)
≥340 (100~150)
Tensile Strength Rm (MPa) 530～630 (all thicknesses)
Elongation A (%) ≥21 (thickness≤60) / ≥20 (>60)
Impact Test (-20℃) KV₂ / J ≥47 (longitudinal), ≥41 (transverse) average of 3 specimens

Process Performance & High Temperature Specifications

  • 180° Bending Testd=3a (thickness≤60); d=4a (>60) Pass
  • High Temp Yield (300℃)Rp0.2 ≥ 250 MPa (reference)
  • Ultrasonic TestingMeets NB/T 47013.3 grade requirements

Typical Application Cases

  • 1 Large Spherical Tanks — A petrochemical project 2000m³ propane spherical tank, thickness 48mm, normalized delivery, NDT Level I
  • 2 Crude Oil Storage Tanks — A coastal refinery project 100,000m³ crude oil tank, using Q370R instead of imports, saving 20% cost
  • 3 Hydropower Pressure Pipes — A hydropower station in Southwest China, thickness 60-80mm, requiring -20℃ impact toughness, Q370R passed in one attempt
  • 4 Export Project — A Southeast Asian refinery project, using Q370R corresponding to P355NH standard, batch supply 5000 tons

Customizable Size Range (Non-standard requirements welcome)

Thickness
4~200 mm (Standard ≤150mm)
Width
1000~4500 mm (Standard ≤4000mm)
Length
2000~22000 mm (Standard ≤18000mm)
Z-Direction Properties Z15/Z25/Z35 Negotiable NDT Grade Level I/II/III Heat Treatment Normalized/Normalized + Tempered
Special size requirements welcome

International Standard Comparison Cards (European Standard Divided into Three Grades)

GB Q370R

GB/T 713.2-2023 Pressure Vessel Steel Plate

  • ✓ Yield Strength ≥370 MPa (3-60mm)
  • ✓ Tensile Strength 530~630 MPa
  • ✓ Impact -20℃ / 47J (longitudinal)
  • ✓ Normalized or Normalized + Tempered delivery
Chinese National Standard
EN P355NH

EN 10028-3 Pressure Vessel Steel Plate

  • ✓ Min Yield 355 MPa (≤16mm)
  • ✓ Tensile 490~630 MPa (≤60mm)
  • ✓ Impact -20℃ / 40J (longitudinal average)
  • ✓ Normalized delivery
European Standard (EN 10028-3)
EN P355NL1

EN 10028-3 Low Temperature Pressure Vessel Steel Plate

  • ✓ Min Yield 355 MPa (≤16mm)
  • ✓ Tensile 490~630 MPa (≤60mm)
  • ✓ Impact -40℃ / 27J (transverse minimum)
  • ✓ Normalized delivery
European Standard (EN 10028-3)
EN P355N

EN 10028-3 Pressure Vessel Steel Plate

  • ✓ Min Yield 355 MPa (≤16mm)
  • ✓ Tensile 490~630 MPa (≤60mm)
  • ✓ Impact 0℃ / 47J (longitudinal)
  • ✓ Normalized delivery
European Standard (EN 10028-3)
ASME SA516Gr70
(Low Temp Impact)

ASME SA-516/SA-516M Pressure Vessel Plate

  • ✓ Yield ≥260 MPa (≤50mm)
  • ✓ Tensile 485~620 MPa
  • ✓ Impact -18℃ / 27J (typical, low temp impact guaranteed)
  • ✓ Hot Rolled/Normalized/Stress Relieved
US ASME Standard

Standard Comparison Brief Analysis: Q370R strength is slightly higher than P355NH (European standard), comparable to US standard SA-516 Gr.70 (low temperature impact) tensile strength but with higher yield requirements. Q370R impact test temperature -20℃, European standard P355NH impact -20℃/40J, P355NL1 is -40℃/27J, P355N is 0℃/47J; US standard SA516Gr70 typically guarantees -18℃ low temperature impact. Specific material selection needs to consider design temperature, impact toughness, and international specifications. We can provide multi-standard certified steel plates.

Domestic Low Temperature Pressure Vessel Plate Comparison (Q370R / 16MnDR / 09MnNiDR)

Comparison of Q370R, 16MnDR, and 09MnNiDR Steel Plates
Comparison Dimension Q370R 16MnDR 09MnNiDR
Executive Standard GB/T 713.2-2023 GB/T 3531 GB/T 3531
Grade Meaning Yield ≥370MPa, Pressure Vessel 16Mn Grade, Low Temp (D), Pressure Vessel (R) 09MnNi Grade, Low Temp (D), Pressure Vessel (R)
Applicable Temperature Above -20℃ -40℃ -70℃
Yield Strength (≤60mm) ≥370 MPa ≥315 MPa ≥300 MPa
Tensile Strength 530~630 MPa 490~620 MPa 430~570 MPa
Impact Temp/Energy -20℃ / ≥47J (longitudinal) -40℃ / ≥47J (transverse) -70℃ / ≥47J (transverse)
Main Alloy Features Mn 1.20~1.70%, Nb micro-alloying Mn 1.20~1.60%, No Ni Ni 0.30~0.80%, Mn 1.20~1.60%
Delivery Condition Normalized or Normalized + Tempered Normalized/Normalized + Tempered Normalized/Normalized + Tempered
Typical Applications Spherical tanks, storage tanks, reactors Low temperature storage tanks, cold region equipment Ethylene, LPG storage tanks, extreme cold equipment
International Equivalent P355NH/P355NL1/P355N (EN), SA516Gr70 (US) P355NL1/P355NL2 (EN) 11MnNi5-3 (EN)

Material Selection Guide:

  • Q370R — Suitable for ambient and medium temperature pressure vessels, selected when pursuing strength advantage and weight reduction design
  • 16MnDR — Suitable for above -40℃ low temperature environments, such as outdoor storage tanks in northern regions, cold region equipment
  • 09MnNiDR — Suitable for -70℃ ultra-low temperature environments, such as ethylene storage tanks, LPG storage tanks and other extreme cold conditions
Standard Size Range
Thickness 6~150 mm, Width 1500~4000 mm, Length 3000~18000 mm
Processing Services Available
Cutting, beveling, NDT, heat treatment, shot blasting & painting
Certificates
EN 10204 3.2 / 3.1 or GB/T Mill Certificate

Get Q370R Latest Inventory | European/US Standard Material Selection Consultation

* Technical parameters on this page are compiled according to GB/T 713.2-2023, specific values subject to mill certificate. Steel plates can match European standard P355NH, P355NL1, P355N and US standard SA516Gr70 (low temperature impact) and other alternative solutions.