Q400GMDR High Manganese Steel Plate for Pressure Equipment
Compliant with GB/T 713.5—2023 | Thermomechanical Rolled (TMCP) | High Manganese Steel with Specified Low Temperature Properties | For Pressure Equipment
1 Scope
This document specifies the designation representation method, ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of high manganese steel with specified low temperature properties for pressure equipment. This document applies to high manganese steel plates (hereinafter referred to as steel plates) with specified low temperature properties for service temperatures not lower than -196℃ and thickness of 5mm ~ 60mm.
2 Normative References
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative referenced document (including any amendments) applies.
| No. | Standard and Title |
|---|---|
| 1 | GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method |
| 2 | GB/T 223.9 Iron, steel and alloy - Determination of aluminum content - Chrome azurol S spectrophotometric method |
| 3 | GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method |
| 4 | GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane photometric method for the determination of titanium content |
| 5 | GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation-iodometric method for the determination of copper content |
| 6 | GB/T 223.23 Iron, steel and alloy - Determination of nickel content - Dimethylglyoxime spectrophotometric method |
| 7 | GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - Thiocyanate spectrophotometric method |
| 8 | GB/T 223.36 Methods for chemical analysis of iron, steel and alloy - The distillation separation-neutral titration method for the determination of nitrogen content |
| 9 | GB/T 223.40 Iron, steel and alloy - Determination of niobium content - Chlorosulfophenol S spectrophotometric method |
| 10 | GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method |
| 11 | GB/T 223.63 Iron, steel and alloy - Determination of manganese content - Sodium periodate (potassium) spectrophotometric method |
| 12 | GB/T 223.75 Steel and iron - Determination of boron content - Methanol distillation-curcumin photometric method |
| 13 | GB/T 223.76 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content |
| 14 | GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace |
| 15 | GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace |
| 16 | GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature |
| 17 | GB/T 229 Metallic materials - Charpy pendulum impact test method |
| 18 | GB/T 232 Metallic materials - Bending test method |
| 19 | GB/T 713.1 Steel plate, sheet and strip for pressure equipments - Part 1: General requirements |
| 20 | GB/T 2975 Steel and steel products - Location and preparation of samples for mechanical testing |
| 21 | GB/T 4336 Carbon steel and low-alloy steel - Determination of multi-element content - Spark discharge atomic emission spectrometric method (routine method) |
| 22 | GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition |
| 23 | GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method) |
| 24 | GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method |
| 25 | NB/T 47013.3 Non-destructive testing of pressure equipments - Part 3: Ultrasonic testing |
3 Terms and Definitions
The terms and definitions defined in GB/T 713.1 apply to this document.
4 Designation Representation Method
The designation of steel is composed of three parts: the Chinese pinyin initial "Q" for yield strength, the specified minimum yield strength (specified plastic extension strength) value, the Chinese pinyin initials "GM" for "high manganese", and the Chinese pinyin initials "DR" for "low temperature vessel".
Example: Q400GMDR. Where: Q—Chinese pinyin initial for yield strength; GM—Chinese pinyin initials for "high manganese"; DR—Chinese pinyin initials for "low temperature vessel"; 400—specified minimum yield strength in MPa (Rp0.2).
5 Ordering Content
The ordering content of steel plates shall comply with GB/T 713.1.
6 Dimensions, Shape, Weight
The dimensions, shape and weight of steel plates shall comply with GB/T 713.1.
7 Technical Requirements
7.1 Designation and Chemical Composition
7.1.1 The designation and chemical composition (ladle analysis) of steel shall comply with Table 1. The chemical composition of Q400GMDR is shown in the table below.
| Grade | C | Si | Mn | P | S | Cr | Cu | B | N |
|---|---|---|---|---|---|---|---|---|---|
| Q400GMDR | 0.35～0.55 | 0.10～0.50 | 22.5～25.5 | ≤0.020 | ≤0.0050 | 3.00～4.00 | 0.30～0.70 | ≤0.0050 | ≤0.0500 |
7.1.2 To improve the properties of the steel, other alloying elements not listed in Table 1 may be added, such as Ni, Mo, Nb, V, Ti, Al, etc., with Ni ≤ 1.0%, Mo ≤ 0.30%, Nb+V+Ti ≤ 0.30%, Al ≤ 0.10%, and the content of these elements shall be indicated in the quality certificate. When Ni ≥ 0.30%, Cu may be less than 0.30%.
7.1.3 The allowable deviation of chemical composition of finished steel plates shall comply with GB/T 713.1.
7.2 Manufacturing Method
The manufacturing method of steel plates shall comply with GB/T 713.1.
7.3 Delivery Condition
Steel plates shall be delivered in thermomechanical rolled (TMCP) condition.
7.4 Mechanical and Technological Properties
7.4.1 The general requirements for mechanical and technological properties of steel plates shall comply with GB/T 713.1.
7.4.2 The mechanical and technological properties of steel plates shall comply with Table 2. The mechanical properties of Q400GMDR are shown in the table below.
| Grade | Transverse Room Temperature Tensile Test | Transverse Charpy (V-Notch) Impact Test | 180° Bending Test b=2a |
||||
|---|---|---|---|---|---|---|---|
| Specified Plastic Extension Strength Rp0.2/MPa (≥) | Tensile Strength Rm/MPa | Elongation A/% (≥) | Test Temperature /℃ | Absorbed Energy KV2/J (≥) | Lateral Expansion LE/mm (≥) | ||
| Q400GMDR | 400 | 800～950 | ≥35 | -196 | ≥60 | ≥0.53 | D=3a |
7.4.3 Upon agreement between the supplier and the buyer, for steel plates with thickness greater than 36mm, an additional set of impact specimens may be taken at 1/2 thickness. The Charpy (V-notch) impact absorbed energy shall be agreed upon by the supplier and the buyer.
7.5 Surface Quality
The surface quality of steel plates shall comply with GB/T 713.1.
7.6 Non-destructive Testing
Ultrasonic testing of steel plates shall be carried out according to NB/T 47013.3, and the acceptance level shall be not lower than Level I. Special requirements shall be specified in the contract.
8 Test Methods
8.1 The chemical composition test of steel shall generally be carried out according to GB/T 4336, GB/T 20123, GB/T 20125 or general chemical analysis methods. In case of arbitration, it shall be carried out according to GB/T 223.5, GB/T 223.9, GB/T 223.11, GB/T 223.17, GB/T 223.18, GB/T 223.23, GB/T 223.26, GB/T 223.36, GB/T 223.40, GB/T 223.59, GB/T 223.63, GB/T 223.75, GB/T 223.76, GB/T 223.85, GB/T 223.86.
8.2 The test methods for each batch of steel plates shall comply with Table 3.
| No. | Inspection Item | Sample Quantity | Sampling Method | Sampling Direction | Test Method |
|---|---|---|---|---|---|
| 1 | Chemical composition (ladle analysis) | 1 per heat | GB/T 20066 | — | See 8.1 |
| 2 | Tensile test | 1 per batch | GB/T 2975 | Transverse | GB/T 228.1 |
| 3 | Bending test | 1 per batch | GB/T 2975 | Transverse | GB/T 232 |
| 4 | Impact test | 3 per batch | GB/T 2975 | Transverse | GB/T 229 |
| 5 | Non-destructive testing | See 7.6 | — | — | NB/T 47013.3 |
| 6 | Surface quality | Each plate | — | — | Visual and measurement |
| 7 | Dimensions and shape | Each plate | — | — | Suitable measuring tools |
9 Inspection Rules
9.1 Inspection and Acceptance: The inspection of steel plates shall be carried out by the supplier's quality inspection department.
9.2 Batch Formation: Steel plates shall be accepted in batches. Each batch shall consist of steel plates from the same rolling piece.
9.3 Sampling Quantity, Sampling Method and Sampling Direction: The sampling quantity, sampling method and sampling direction for each batch of steel plates shall comply with Table 3.
9.4 Re-inspection and Judgment Rules: The re-inspection and judgment rules of steel plates shall comply with GB/T 713.1.
9.5 Rounding of Numerical Values: Rounding of numerical values shall comply with GB/T 713.1.
10 Packaging, Marking and Quality Certificate
The packaging, marking and quality certificate of steel plates shall comply with GB/T 713.1.